Hell's Park Underside

Hell's Park Underside is a mode where you fight bosses that have customizable difficulty levels. It is unlocked after clearing all 100 "surface" stages of Hell's Park.

Overview

Hell's Park Underside re-uses the area names of the original Hell's Park, but it has only 1 boss fight (consisting of 4 enemies) per area. Each boss can have their difficulty level customized, starting at level 1 and going up to an unknown maximum.

Each area is weak to a specific element, and has 3 possible rulesets for which kinds of demons you can bring in. 3 areas are available each month, and the available ruleset for each area also changes each month.

Clearing a stage for the first time grants gold and silver Friendship Badges, which can be exchanged for rewards. These first-clear rewards are reset every month.

Rules

All battles in Hell's Park Underside have a general set of restrictions in place:

• You cannot pierce attributes (for example, Fire Pierce effects will not work). Enemies can still pierce, though!
• Attribute affinity down does not work.
• Anti-pierce effects do not work.
• Effects that increase your Press Turns or decrease the enemy's Press Turns do not work.
• Effects that prevent spending a Press Turn (such as Chief God's Rage) do not work.
• Remnants and Critical Hits will not use half a Press Turn (however, if an attack with those qualities also hits a weakness, then you do use half a Press Turn).
• Damage reduction and reverse damage reduction do not work.
• Dx2 Skills (from Liberators) do not work.

Additionally, each area will impose their own restrictions on the demons you can bring, depending on the difficulty level selected.

However, you are allowed to use items for reviving, healing, etc!

You are also allowed to use your Devil Connector.

Difficulty levels

Before challenging a stage, its difficulty level can be selected. Higher difficulties will increase enemy stats, add skills to the enemy, and add team-building restrictions.

• Enemies start with 3 skills. They gain their 4th at level 3, their 5th at level 6, and their 6th at level 9.
• After level 9, the only thing that changes is stats.

When a stage is cleared, the player receives the reward for that level, as well as the rewards for all levels below it. These rewards reset monthly.

Initially, only 10 difficulty levels are available for each stage. Clearing level 10 on a stage unlocks levels 11-20 for that stage, clearing level 20 unlocks levels 21-30, and so on.

• The maximum possible level isn't currently known, but someone has reached level 240. It's probably safe to assume that the levels are effectively infinite.

Level	Gold	Silver
1	50	50
2	50	50
3	50	200
4	20	200
5	20	200
6	10	300
7	10	300
8	10	300
9	5	400
10	5	400

After the first 10 levels, each level no longer gives gold badges. Instead, each level gives a standardized amount of silver badges, depending on the level range.

Level	Silver per level
11-20	300
21-100	50
101+	10

Score and ranking

When you clear a battle in Hell's Park Underside, you'll earn a score based on your performance. Score is awarded based on several factors:

• The level of the battle cleared (the higher, the better).
• Clearing the battle in a small amount of turns.
• Having unused Press Turns remaining.
• Dealing a lot of total damage.

Your score will be assigned a letter rank, based on how high it is:

Rank	score
SSS	1,200,000+
SS	600,000-1,199,999
S	300,000-599,999
A	125,000-299,999
B	68,500-124,999
C	38,500-68,499
D	26,500-38,499
E	17,500-26,499
F	11,500-17,499
G	0-11,499

Ranking rewards

silver badges will be rewarded each month, based on how your score ranks against other players.

Per-area score ranking rewards

Rank	Reward
1-10	silver badge x1,000
11-100	silver badge x500
101-1,000	silver badge x400
1,001-10,000	silver badge x300
10,001-30,000	silver badge x200
30,001-9,999,999	silver badge x100

Total score ranking rewards

Rank	Reward
1	silver badge x3,000, "Underside MVP" title
2	silver badge x3,000, "Proven Strength" title
3	silver badge x3,000, "A True Secret Trick" title
4-10	silver badge x3,000, "Famous Behind the Scenes" title
11-100	silver badge x1,500
101-9,999,999	silver badge x1,000

Special Skills

Some skills have special effects that only activate in Hell's Park Underside. Some of these skills are further restricted to only a specific area of HPU, and/or are exclusive to certain demons.

Type	Name	Specific area?	Exclusive?	Notes
Passive	Pixie (Underside)	-	Pixie	Available through silver badges in Jan 2025.
Passive	Illuyanka (Underside)	Grave Area only	Illuyanka	Available through silver badges in Feb 2025. A Red Illuyanka with this skill was distributed on Jan 20, 2025.
Passive	Koumokuten (Underside)	Kawara Area only	Koumokuten	Available through silver badges in Mar 2025.
Passive	Fortunate park visitor	-	-	Rare drop from Hell Genome Cube (costs silver badges)
Phys	Struggle Slash (Underside)	-	-	Rare drop from Hell Genome Cube (costs silver badges)
Fire	Trisagion (Underside)	-	-	Rare drop from Hell Genome Cube (costs silver badges)
Fire	Fire Slash (Underside)	-	-	Rare drop from Hell Genome Cube (costs silver badges)
Ice	Ice Age (Underside)	-	-	Rare drop from Hell Genome Cube (costs silver badges)
Ice	Ice Slash (Underside)	-	-	Rare drop from Hell Genome Cube (costs silver badges)
Light	Thunderclap (Underside)	-	-	Rare drop from Hell Genome Cube (costs silver badges)
Light	White Slash (Underside)	-	-	Rare drop from Hell Genome Cube (costs silver badges)

Rewards

Friendship Badge shop

Gold badges

Exchange Lineup	Gold badge cost	Cap
Lost Name	600	1
Lost Name Spirit × 10 (1st set)	100	10
Lost Name Spirit × 10 (2nd set)	150	20
Lost Name Spirit × 10 (3rd set)	200	30
Transcend Stone for Lost Name × 1 (1st set)	100	94
Transcend Stone for Lost Name × 1 (2nd set)	200	88

Notes:

• Initially only Lost Name is available, but after buying him, the spirit and transcend options are unlocked.
• Each set of spirits is unlocked after the previous set is exhausted. The same concept applies to the transcend stones.
  • Panel 1 costs 1,000 badges, Panel 2 costs 3,000 badges, and Panel 3 costs 6,000 badges, totaling 10,000 badges to get all 3 panels.
  • Gold badge income is 690 per month (230 per area) if you clear level 10 of each area.

Silver badges

Exchange Lineup	Silver badge cost	Cap
Hell Genome Cube × 1	1,000	No Cap
Pixie (Underside) Genome	3,000	1
Illuyanka (Underside) Genome	3,000	1 / Month
Koumokuten (Underside) Genome	3,000	1
Sword of Kusanagi 5★	100	20 / Month
Yata Mirror 5★	500	5 / Month
Yasaka Magatama 5★	200	5 / Month
Kasane Magatama	3,000	2 / Month
Aether Crystal	1,500	1 / Month
Skip Ticket (Sin) x20	3,000	1 / Month
Essence of Sin x160	2,000	2 / Month
Mitama Extract St x10	300	5 / Month
Mitama Extract Ma x10	300	5 / Month
Mitama Extract Vi x10	300	5 / Month
Mitama Extract Ag x10	300	5 / Month
Mitama Extract Lu x10	300	5 / Month
Blank Genome	1,500	2 / Month
6★ Brand Cube	500	10 / Month

• Silver badge income is 7,200 per month (2,400 per area) if you clear level 10 of each area.
  • If you clear level 20 of each area, add 9,000 (3,000 per area) to that.
  • Each set of 10 levels from level 21-100 gives 1,500 (500 per area).
  • Each set of 10 levels from level 101+ gives 300 (100 per area).
  • Assuming you are in the lowest ranking tier, you can expect another 1,300 per month (1,000 for total score, plus 100 per area).

Hell Genome Cube

The Hell Genome Cube gives a random skill genome from a very large pool. A few of the skills are rare and exclusive:

Genome	Notes
Fortunate park visitor	Rare, exclusive
Struggle Slash (Underside)	Rare, exclusive
Trisagion (Underside)	Rare, exclusive
Fire Slash (Underside)	Rare, exclusive
Ice Age (Underside)	Rare, exclusive
Ice Slash (Underside)	Rare, exclusive
Thunderclap (Underside)	Rare, exclusive
White Slash (Underside)	Rare, exclusive

Rotation history

3 areas are available per month, with the available areas and their challenge conditions rotating each month. The demon-specific Underside skill in the shop also rotates each month.

Month	Challenge type			Shop genome
	Fusibles	Race	Low-grade
Jan 2025	Spike Hell	Kawara	Grave	Pixie (Underside)
Feb 2025	Spike Hell	Kawara	Grave	Illuyanka (Underside)
Mar 2025	Kawara	Spike Hell	Sanzu River	Koumokuten (Underside)

Guide

Kawara Area (weak to Phys)

Overview

Feng Huang	Hresvelgr	Tsukuyomi	Feng Huang

Resistances
Feng Huang	Wk	Nu	Wk	-	-	-	-
Hresvelgr	Wk	Wk	Dr	-	Nu	-	-
Tsukuyomi	Wk	Nu	Nu	Rs	Rs	-	-
Feng Huang	Wk	Nu	Wk	-	-	-	-
Battle Speed			10,000

Skills on multiple demons:

Skills on Feng Huangs only:

Skills on Hresvelgr only:

Skills on Tsukuyomi only:

Explanation

• The enemy will start the battle by casting Repel Physical. Tsukuyomi will cast it again when the enemy turn starts, and Hresvelgr will cast it if anyone on your team dies.
• The Feng Huangs apply Luster Candy and Debilitate at the start of the battle.
• Hellbound: Ice will apply 5 stacks of Spirit Chains of Suppression to you.
• If you fail to kill the adds by the start of their second turn, they will hit you with a bulwark-piercing, 100%-crit enrage AoE. Hresvelgr will do one too, if he isn't dead by his third turn.

Fusibles challenge

Team restrictions:

Difficulty	Restriction
Lv 3-5	3 or more demons must be fusible*.
Lv 6-8	4 or more demons must be fusible.
Lv 9+	All 5 demons must be fusible.
Lv 6+	1 or more demons must be grade 79 (4★ base) or lower.
Lv 9+	1 or more demons must be Clear.

Notes regarding fusibles:

• Multi-fusions count.
  • Beelzebub☆ counts, despite needing a gacha-exclusive material to make him.
  • The following limited-time multi-fusions count: Masakado A, Alice A, Asura. All other limited-time multi-fusions do not count.
• Pixie and Slime count, even though you cannot fuse them.

General strategy:

• For level 9+, you need to run a team of all fusibles, with a focus on Phys damage. One of your demons must also be Clear, and one must be grade 79 or lower (meaning 4★ or lower base rarity).
• Transfer Tetra Break to your fastest unit, and have them cast it when the fight starts, to remove the enemy's shield.
• After the shield is down, spam Phys attacks to hit the enemy's weaknesses. Try to ensure Tsukuyomi dies quickly, so he can't re-cast the shield.
• Try to bring demons that can counteract the initial Luster Candy and Debilitate. There is a decent chance your attacks will miss the boss if the enemy still has a full EVAC swing in their favor.
• If you have a Koumokuten with the skill Koumokuten (Underside), bring him.
• Cover your Ice weaknesses, to prevent Hresvelgr from killing anyone. If he gets a kill, he re-casts his shield and casts a North Wind AoE. This can quickly snowball into a long combo of North Winds that can wipe your team.

Sample party

Asura Skills Tetra Break Resist Ice Brands PATK% Divine Requirements -

Shiva Skills Phys Boost Resist Ice Brands PATK% War Requirements -

Flauros Skills Phys Amp Resist Ice Brands PATK% Divine or War Requirements -

Seth Skills Charge Master Assassin Brands PATK% Divine or War Requirements -

Koumokuten Skills Koumokuten (Underside) God's Hand Brands PATK% War Requirements -

Team notes:

• Asura is the fastest unit, so he has Tetra Break. His skill Ashura can also remove the enemy team's buffs.
• Shiva's standard attack is effectively a 0 MP Vorpal Blade, useful for AoE. Red has God's Hand as a single target option, and it becomes cheaper with panel 3. He shouldn't be having MP issues, and can safely use War brands.
  • Shiva can also remove the enemy's Repel Physical by using Pralaya, but that won't trigger Koumokuten's bonus effects.
• Flauros provides ATK/EVAC Buffs whenever he uses Iron Fist.
• Seth is mainly here for damage - use Ouas if you're in a full turn, Charge if you're in a half turn. In higher levels, he can cast Debilitate just before Hresvelgr's first turn, softening the boss's attacks and reducing the chance that someone will die.
• Koumokuten with his underside skill provides a 20% Phys damage and 50% accuracy aura to the team, and when a team member uses Tetra Break, he reacts with DEF and EVAC debuffs, plus a Phys hit directed at the boss.
  • Koumokuten actually has Tetra Break innately, so he could theoretically trigger his own bonus effects. However, his base agi is so low that getting him to the front of the party may be difficult.
  • His colors don't offer very much, so we opt to run him in Clear to fit the Clear and 4★ requirements.
  • Cheap to build by using 3★ to get skill points (4 SP for a Koumokuten dupe, or 1 SP for any other 3★). You can level his Hades Blast by transferring it from Ose dupes.
  • He also has a 3 MP discount for Phys skills, meaning he should not have MP problems and can safely run War brands. This also means he can safely use powerful high-MP attack skills such as God's Hand, but cheaper options such as Oni-Kagura can also work. Giving him Struggle Slash (Underside) would be ideal, should you pull one from the random cubes.
• Ice weaknesses are covered on everyone, to prevent Hresvelgr from setting off a death combo.

Other options worth considering:

• Gogmagog: Good damage, and has Repel Ice for 30% Ice damage reduction. May have accuracy issues if you don't have Koumokuten Underside, though.
• Odin: 176 str, P3 gives 10% phys damage, Clear has Merciless Blow. Gungnir (145 power AoE w/ 30% crit). He's expensive to panel, however.
• Wu Kong: 235 str, P3 gives 10% phys damage, P2 gives 10% crit. Titanomachia (125 power AoE w/ 30% crit) and Oni-Kagura (135 power single w/ 30% crit).
• Girimekhala: 216 str, P3 gives 10% phys damage. Megaton Press (105 power AoE w/ 30% crit) and Binge Eating (140 power single). Mega Boost gives himself both Charge and Might.
• Hanuman: 223 str, P3 gives 10% phys damage. Vorpal Blade (140 power AoE) and Madness Nails (130-195 power random). Can be re-used for the race challenge.
• Yatagarasu: 184 str, P3 gives 10% phys damage, Clear has Phys Boost. Hades Blast (120 power AoE). Needs Resist Ice.
• Valkyrie: 196 str, has Phys Boost. Heat Wave (85 power AoE w/ 10% crit), Fatal Sword (100 power single).
• Fomorian: 183 str, Clear has Back Attack. Herculean Strike (100 power AoE). Can be re-used for the race challenge.

Race challenge

Team restrictions:

Difficulty	Restriction
Lv 3-5	All 5 demons must be of the races Genma, Kishin, Night, Drake, or Tyrant.
Lv 6-8	All 5 demons must be of the races Genma, Kishin, Night, or Drake.
Lv 9+	All 5 demons must be of the races Genma, Kishin, or Night.

General strategy:

• Transfer Tetra Break to your fastest unit, and have them cast it when the fight starts to remove the enemy's shield.
• After the shield is down, spam Phys attacks to hit the enemy's weaknesses. Try to ensure Tsukuyomi dies quickly, so he can't re-cast the shield.
• Try to bring demons that can counteract the initial Luster Candy and Debilitate. There is a decent chance your attacks will miss the boss if the enemy still has a full EVAC swing in their favor.
• If you have a Koumokuten with the skill Koumokuten (Underside), bring him.
• Cover your Ice weaknesses, to prevent Hresvelgr from killing anyone. If he gets a kill, he re-casts his shield and casts a North Wind AoE. This can quickly snowball into a long combo of North Winds that can wipe your team.

Sample party

Marici Skills Tetra Break Phys Boost Brands PATK% Lead x2 Requirements -

Fionn mac Cumhaill Skills Back Attack Phys Boost Brands PATK% Divine or War Requirements -

Futsunushi Skills Back Attack Phys Boost Brands PATK% Divine or War Requirements -

Cu Chulainn Skills Serial Killer Phys Boost Brands PATK% Divine or War Requirements Panel 4

Koumokuten Skills Koumokuten (Underside) God's Hand Brands PATK% Divine or War Requirements -

Team notes:

• Marici: 195 str, Daylight Blade (200 power single w/ 50% crit). P1 and P2 give accuracy and crit dmg aura. She has 2x Lead set effects to put her in the first spot (otherwise Fionn would be first), and she has Tetra Break to remove the shield ASAP.
• Fionn mac Cumhaill: Very high damage, applies Zenith with Moon-White Blade, and casts one ATK Buff for 1 turn at start of combat.
• Futsunushi: Team-wide Might on the first turn, then he can spam Iai Isshin which grants him Charge with every cast.
• Cu Chulainn: Just damage, but he may have accuracy issues until panel 4.
• Koumokuten with his underside skill provides a 20% Phys damage and 50% accuracy aura to the team, and when a team member uses Tetra Break, he reacts with DEF and EVAC debuffs, plus a Phys hit directed at the boss.
  • Koumokuten actually has Tetra Break innately, so he could theoretically trigger his own bonus effects. However, his base agi is so low that getting him to the front of the party may be difficult.
  • His colors don't offer very much, so we opt to run him in Clear to fit multiple rulesets.
  • Cheap to build by using 3★ to get skill points (4 SP for a Koumokuten dupe, or 1 SP for any other 3★). You can level his Hades Blast by transferring it from Ose dupes.
  • He also has a 3 MP discount for Phys skills, meaning he should not have MP problems and can safely run War brands. This also means he can safely use powerful high-MP attack skills such as God's Hand, but cheaper options such as Oni-Kagura can also work. Giving him Struggle Slash (Underside) would be ideal, should you pull one from the random cubes.
• Ice weaknesses are covered on everyone, to prevent Hresvelgr from setting off a death combo.

Other options worth considering:

• Albedo: Good damage and team-wide Zenith for 3 turns.
• Hanuman: 223 str, P3 gives 10% phys damage. Vorpal Blade (140 power AoE) and Madness Nails (130-195 power random).
• Bishamonten: 207 str, P3 has 10% phys damage. Hades Blast (120 power AoE) and Berserker God (160 power single). Null Ice for 30% Ice damage reduction.
  • Alternatively, Purple has Back Attack if you give up Red's AoE.
• Zhong Kui: 254 str, applies one ATK Buff for 3 turns at start of combat. Megaton Raid (180 power single) and Oni-Kagura (135 power single w/ 35% crit). Panels do not boost damage.
• Thor: 201 str, only P1 boosts damage. Gigantomachia (160 power AoE) and Megaton Raid (180 power single). Has Charge.
• Fomorian: 183 str, Clear has Back Attack. Herculean Strike (100 power AoE)
• Jikokuten: 182 str, P3 has 8% phys damage. Hades Blast (120 power AoE) and Megaton Raid (180 power single).

Spike Hell Area (weak to Fire)

Overview

Mandrake	Heimdall	King Frost	Mandrake

Resistances
Mandrake	-	Wk	Wk	-	-	-	Nu
Heimdall	-	Wk	Nu	-	Dr	Nu	Rs
King Frost	-	Wk	Nu	-	-	Rs	-
Mandrake	-	Wk	Wk	-	-	-	Nu
Battle Speed			10,000

Skills on multiple demons:

Skills on Mandrakes only:

Skills on Heimdall only:

Skills on King Frost only:

Explanation

• Hellbound: Phys will apply 5 stacks of Spirit Chains of Suppression to you.
• Hell Eater drains your MP whenever your turn starts, and King Frost will drain your MP with Cold World Underside when he attacks (as well as applying ). When Heimdall falls below 50% HP, his Stout Horn Underside will also start draining your MP.
• If you fail to kill the adds by the start of their second turn, they will hit you with a bulwark-piercing, 100%-crit enrage AoE. Heimdall will do one too, if he isn't dead by his third turn - however his lacks phys pierce, so it can be reflected back at him with Repel Physical.

Fusibles challenge

Team restrictions:

Difficulty	Restriction
Lv 3-5	3 or more demons must be fusible*.
Lv 6-8	4 or more demons must be fusible.
Lv 9+	All 5 demons must be fusible.
Lv 6+	1 or more demons must be grade 79 (4★ base) or lower.
Lv 9+	1 or more demons must be Clear.

Notes regarding fusibles:

• Multi-fusions count.
  • Beelzebub☆ counts, despite needing a gacha-exclusive material to make him.
  • The following limited-time multi-fusions count: Masakado A, Alice A, Asura. All other limited-time multi-fusions do not count.
• Pixie and Slime count, even though you cannot fuse them.

General strategy:

• For level 9+, you need to run a team of all fusibles, with a focus on Fire damage. One of your demons must also be Clear, and one must be grade 79 or lower (meaning 4★ or lower base rarity).
• Your primary objective is to kill King Frost with Fire attacks on the first turn. If you don't, then he will hit into your weaknesses (most fusible Fire attackers are weak to Ice), debuff your defense, and steal all your MP. The Mandrakes should go down easily afterwards, allowing you to isolate Heimdall.
  • Any team slots that aren't providing utility should deal Fire damage or boost it.
  • Cybele does good damage and has a fire damage aura for the team (+10% damage at base, upgraded to +20% at panel 3). She is also Clear, fulfilling that team requirement.
  • Panel 3 Metatron gives a +20% magic damage aura to the team. Transfer a Fire spell so he can contribute his own damage, as well.
• MP management is very tight in this fight, consider running Divine brands on as many demons as possible.
• Have Huang Long use Five Elements ( Repel Almighty Magic), which will stop Heimdall from using his unique Almighty attack. Now, Heimdall will resort to standard attacks.
  • If possible, have Huang Long at panel 4 for his magic damage aura (+20% magic dealt and -20% magic received for the party while under Repel Magic). In this case, cast Five Elements ASAP to help push damage against King Frost.
• Bring demons with innate Null/Repel/Drain Phys, or a Null Phys genome transferred. Heimdall doesn't have Phys Pierce, so as long as Repel Almighty Magic is active, he will be unable to attack anyone that blocks Phys. This applies to both his standard attacks and his enrage AoE, which are both Phys.
  • Example 5★ demons with innate NDR Phys: Teal Quetzalcoatl, Teal Gogmagog, Zaou-Gongen, Erlkonig, Fafnir, Masakado A, Beelzebub☆
  • If you cast Tetrakarn or use a Phys Reflector (for Repel Physical) just before Heimdall's enrage, then you can reflect it back at him, potentially dealing a lot of damage to finish him off. However, you cannot have both Repel Physical and Repel Magic active at the same time, so only take this chance if you are sure the reflect will kill Heimdall. If Heimdall survives, then he will be free to use his Almighty attack, and might kill you.
• For the 4★ slot:
  • Prometheus offers good fire damage. Red gets a cheap Maragidyne, while Purple gets Infinite Chakra for more MP recovery.
  • Girimekhala, Rangda, Hecatoncheires, Teal Wu Kong have innate NDR Phys.

Sample party

Huang Long Skills Speedster Tetrakarn Brands Divine Requirements Panel 4

Cybele Skills Fire Boost Back Attack Brands MATK% Divine Requirements Panel 3

Metatron Skills Butcher Maragidyne Brands MATK% Divine Requirements Panel 3

Surt Skills Fire Boost Fire Amp Brands MATK% Divine Requirements Panel 3

Prometheus Skills Merciless Blow Serial Killer Brands MATK% Divine Requirements Panel 3

Team notes:

• Everyone should have Divine brands, due to the tightness of MP in this fight.
• Huang Long for Repel Almighty Magic and his panel 4 magic damage aura. Yellow can also buff with Luster Candy to push more damage. He should go first in the party, so he can activate his magic damage aura ASAP.
• Cybele satisfies the Clear requirement, offers a team Fire damage aura (ideally the upgraded version at panel 3), and has good innate Fire skills.
• Metatron for his panel 3 magic damage aura. He also has Maragidyne so he can contribute his own damage.
• Prometheus satisfies the 4★ requirement, and does good Fire damage. Red gets a cheap Maragidyne.
• Surt pushes damage against King Frost.
• Remember to use Tetrakarn or use a Phys Reflector just before Heimdall does his Phys enrage!

Other options worth considering:

• Anubis: 217 magic, Purple has Merciless Blow. Transfer Agidyne + Fire Boost.
• Titania: 235 magic, Purple has Back Attack. Transfer Agidyne + Fire Boost.
• Efreet: 208 magic, has Fire Boost and Purple has Back Attack. Maragi and Agilao. Alternatively, can use Clear for discounted Agidyne.

Race challenge

Team restrictions:

Difficulty	Restriction
Lv 3-5	All 5 demons must be of the races Beast, Vile, Femme, Tyrant, or Godly.
Lv 6-8	All 5 demons must be of the races Beast, Vile, Femme, or Godly.
Lv 9+	All 5 demons must be of the races Beast, Vile, or Tyrant.

• Your primary objective is to kill King Frost with Fire attacks on the first turn. If you don't, then he will hit into your weaknesses, debuff your defense, and steal all your MP. The Mandrakes should go down easily afterwards, allowing you to isolate Heimdall.
  • Any team slots that aren't providing utility should deal Fire damage or boost it.
• MP management is very tight in this fight, consider running Divine brands on as many demons as possible.
• The featured races do not have access to Repel Almighty Magic, so you'll need to use a different method to survive Heimdall's Almighty attack spam. For example: Spirit Chains of Intimidation.
• If you cast Tetrakarn or use a Phys Reflector (for Repel Physical) just before Heimdall's Phys enrage, then you can reflect it back at him, potentially dealing a lot of damage to finish him off.
  • However, if you plan to do this, make sure Heimdall doesn't have any stacks of Intimidation, as those will reduce the power of the reflected damage.

Sample party

Lost Name Skills Fire Boost Assassin Brands HP% Life or Divine Requirements -

Moloch Skills Fire Survivor Fire Boost Brands HP% Life or Divine Requirements -

Belial Skills Serial Killer Fire Boost Brands PATK% Divine Requirements -

Mada Skills Fire Slowda Fire Boost Brands MATK% Divine Requirements -

Surt A Skills Butcher Fire Boost Brands MATK% Divine Requirements -

Team notes:

• Lost Name is easily accessible, does good damage, and applies Spirit Chains of Intimidation to help the team survive. His panel 1 helps significantly, dropping the cost of Fatal Burn to just 4 MP at max skill level.
• Moloch provides a 40% Fire damage aura.
• Surt A applies DEF Debuff. Panel 2 can also change his Standard Attack into Fire magic, allowing him to attack without needing MP.
• The remaining members are just whatever Fire users are available.
• Remember to use Tetrakarn or use a Phys Reflector just before Heimdall does his Phys enrage!

Other options worth considering:

• Moloch A: Applies Spirit Chains of Corrosion, and offers a 40% damage aura against foes affected by Spirit Chains.

Grave Area (weak to Ice)

Overview

Shiki-Ouji	Mithras	Cybele	Shiki-Ouji

Resistances
Shiki-Ouji	Nu	Wk	Wk	-	-	Rs	Rs
Mithras	-	Dr	Wk	-	-	Nu	-
Cybele	-	Dr	Wk	-	Rs	Nu	Rs
Shiki-Ouji	Nu	Wk	Wk	-	-	Rs	Rs
Battle Speed			10,000

Skills on multiple demons:

Skills on Shiki-Oujis only:

Skills on Mithras only:

Skills on Cybele only:

Explanation

• Hellbound: Fire will apply 5 stacks of Spirit Chains of Suppression to you.
• If you fail to kill the adds by the start of their second turn, they will hit you with a bulwark-piercing, 100%-crit enrage AoE. Mithras will do one too, if he isn't dead by his third turn.
• Mithras will follow up with Covenant Bless Underside whenever he, his allies, or you use a Fire/ Light attack. The hit doesnt hurt, but it does heal Mithras and his party, which can prolong the fight. Cybele and the Shiki-Ouji on the right also have healing spells.

Low-grade challenge

Team restrictions:

Difficulty	Restriction
Lv 3-5	3 or more demons must be grade 83 or lower.
Lv 6-8	4 or more demons must be grade 83 or lower.
Lv 9+	All 5 demons must be grade 83 or lower.
Lv 6-8	1 or more demons must be grade 79 (4★ base) or lower.
Lv 9+	2 or more demons must be grade 79 (4★ base) or lower.
Lv 9+	1 or more demons must be grade 59 (3★ base) or lower.

General strategy:

• Bring as many Ice attackers as possible, and kill the adds first so they can't heal Mithras.
• If you have an Illuyanka with the skill Illuyanka (Underside), bring that, as it trivializes this fight.

Sample party

Black Rider Skills Mabufudyne Ice Boost Brands MATK% Divine or Spell Requirements -

Frost Ace Skills Ice Amp Merciless Blow Brands MATK% Divine or Spell Requirements -

Ym Skills Merciless Blow Serial Killer Brands MATK% Divine or Spell Requirements -

Illuyanka Skills Illuyanka (Underside) Ice Boost Brands MATK% Spell Requirements -

King Frost Skills Back Attack Auto-Taruka Brands MATK% Divine or Spell Requirements -

Team notes:

• Illuyanka's contribution mainly comes from his 80% Ice damage aura and his Ice AoE chain.
  • He also has a 3 MP discount for Ice skills, meaning he should not have MP problems and can safely run Spell brands. This also means he can safely use powerful high-MP attack skills such as Ice Age or Ice Age (Underside).
  • We're using Clear so Illuyanka can be used in multiple rule sets. This happens to give him Bufudyne, meaning the other transfer slot should be a damage booster.
  • A small optimization is to build a Purple Illuyanka for the +10 magic from Magic Amp II. His transfer should be Ice Age.
  • If you happen to pull Ice Age (Underside) from the random cubes, use that regardless of color (with Purple performing slightly better than Clear).
  • Cheap to build by using 3★ to get skill points (4 SP for an Illuyanka dupe, or 1 SP for any other 3★). You can level his Ice Breath by transferring it from Mermaid or Illuyanka dupes, and can level his Bufudyne by transferring it from Orochi dupes.
• King Frost provides DEF Debuff via his skill Cold World, to help push the damage. We also give him Auto-Taruka for ATK Buff, ensuring we have a full offensive buff swing. Teal covers his weakness.
• The rest of the team are just Ice attackers that don't have open weaknesses to Fire or Light, to ensure Mithras can't get extra turns off them. Resist Fire or Resist Light can be transferred to patch weaknesses, if needed.

Other options worth considering:

• Beiji-Weng: 186 magic, has Ice Boost and P3 has 10% Ice damage. Bufudyne and Mabufudyne. Will need Resist Fire.
• Anubis: 217 magic, Purple has Merciless Blow. Transfer Bufudyne + Ice Boost.
• Titania: 235 magic, Purple has Back Attack. Transfer Bufudyne + Ice Boost.

Sanzu River Area (weak to Light)

Overview

Chatterskull	Ixtab	Nidhoggr	Chatterskull

Resistances
Chatterskull	-	Dr	Wk	-	-	Wk	Nu
Ixtab	-	-	-	-	-	Wk	Rp
Nidhoggr	Nu	-	Nu	Wk	-	Wk	-
Chatterskull	-	Dr	Wk	-	-	Wk	Nu
Battle Speed			10,000

Skills on multiple demons:

Skills on Chatterskulls only:

Skills on Ixtab only:

Skills on Nidhoggr only:

Explanation

• Hellbound: Dark will apply 5 stacks of Spirit Chains of Suppression to you.
• Vengeance Blow - When a Chatterskull is killed, it will cast an Almighty hit with Mortal on their attacker.
• Nastrond Underside - When an enemy dies, Nidhoggr gets a full heal and a 20% HP Bulwark. When your turn ends, a random enemy gets revived at 100% HP.
• Yache Underside - When Ixtab is killed, she will deal 4 AoE hits of 10,000 fixed damage + Mortal, which also pierce Bulwarks and ignore endures. The gist is that she will wipe your party unless she dies last.
• If the adds are not dead at the start of their second turn, they will hit you with a bulwark-piercing, 100%-crit enrage AoE. Ixtab will do one too, if she isn't dead by her third turn.

Low-grade challenge

Team restrictions:

Difficulty	Restriction
Lv 3-5	3 or more demons must be grade 83 or lower.
Lv 6-8	4 or more demons must be grade 83 or lower.
Lv 9+	All 5 demons must be grade 83 or lower.
Lv 6-8	1 or more demons must be grade 79 (4★ base) or lower.
Lv 9+	2 or more demons must be grade 79 (4★ base) or lower.
Lv 9+	1 or more demons must be grade 59 (3★ base) or lower.

General strategy

• Set up Evade Mortal (with Tetraja, for example) as soon as possible, and refresh it when it runs out. Make sure it's active to shield the revenge Mortal hit whenever you kill a Chatterskull.
• Bring as many Light attackers as possible.
• Focus on killing Nidhoggr first (preferably with single-target attacks), then kill the Chatterskulls, and kill Ixtab last.
  • If Nidhoggr does not die first, then he will get a full heal and a 20% HP bulwark when each of the Chatterskulls die.
  • If Ixtab is not killed last, then you will wipe.
  • Do not simply AoE everything down! - if you try that, then the skulls will die first, Nidhoggr will heal + bulwark, then Ixtab will die, leaving Nidhoggr still alive, and you will wipe.
  • Nidhoggr is also weak to Elec, and nobody NDR's it. Therefore, Elec AoE units such as Queen Mab can heavily damage Nidhoggr while only lightly damaging the other enemies.
• Try to cover your Dark weaknesses, as Ixtab will spam Dark AoEs during her turn.

Sample party

Sukuna-Hikona Skills Tetraja Resist Dark Brands MATK% Divine or Spell Requirements -

Queen Mab Skills Fire Enhancement Elec Enhancement Brands MATK% Divine or Spell Requirements -

Baldur Skills Back Attack Resist Dark Brands MATK% Divine or Spell Requirements -

Lailah Skills Back Attack Resist Dark Brands MATK% Divine or Spell Requirements -

Ishtar Skills Merciless Blow Resist Dark Brands MATK% Divine or Spell Requirements -

Team notes:

• Put Tetraja on the fastest unit, so we can cast it ASAP.
• Queen Mab: Her chains won't work, due to Spirit Chains of Suppression. But that's fine, as a couple casts of Cuailnge should already be a lot of Elec damage against Nidhoggr.
• Baldur: Applies -1 MP cost to the team's Light skills, and offers a 5-15% Light damage aura. He's also a 4★, to help meet challenge requirements.
  • You can level his Hamadyne by transferring it from Sandalphon dupes.
• Lailah: does surprisingly good Light damage for a 3★ (206 magic, has Light Boost), and also fulfills challenge requirements. Red gives her Hamadyne as a single-target attack option.
  • Cheap to build by using 3★ to get skill points (4 SP for a Lailah dupe, or 1 SP for any other 3★). You can level her Hamadyne by transferring it from Sandalphon dupes.
• Ishtar: Mesopotamian Star sets up buffs and debuffs (both for offense, and for helping survive Ixtab's attacks), then she can switch to using Mahamaon afterwards. Red offers Thunderclap as a single-target attack option.
• All weaknesses to Dark are covered, to ensure the team survives Ixtab's first turn and then kills her on your second turn.
  • This is technically optional with P3 Ishtar, as she's just bulky enough to be the sole survivor of the weakness spam (even with her own weakness open), and can then finish Ixtab. This will eventually stop working at around level 50, however, at which point you need the DPS from the team surviving to win.
• From there, just use whatever Light units are available, with whichever damage boosters you have. Try not to boost your AoE damage too much, as to not kill Chatterskulls too early.
• In this setup, Queen Mab eats both revenge hits from the Chatterskulls, so make sure to heal her before ending your turn.

Other options worth considering:

• Mastema: 201 magic, Purple has Light Amp and P1 has 15% Light damage. However, you may want to transfer Hamadyne since Trial of Hate is an AoE.
• Anubis: 217 magic, Purple has Merciless Blow. Transfer Hamadyne + Light Boost.
• Titania: 235 magic, Purple has Back Attack. Transfer Hamadyne + Light Boost.
• Principality: 195 magic, Purple has Light Boost. Hamaon. Needs Resist Dark.
• Sandalphon: 160 magic, P3 has 10% damage. Hamadyne and Mahamaon. Null Dark for 30% Dark damage reduction.