Hell's Park Underside/Sanzu River Area/Light

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.

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.
  • If you bring Arianrhod with the skill Arianrhod (Underside), then she will automatically cast Evade Mortal at the start of your turn.
• 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 with Light! - 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.

Underside skill demons

Arianrhod

Arianrhod (Underside) effect overview

• Self gets 50% HP, 180% Light damage, 20% accuracy, 3 MP discount for Light skills, and immunity to Spirit Chains of Suppression.
• The team gets 30% Light damage and 30% accuracy.
• At the start of your team's turn, your entire team gets Evade Mortal (up to 3 times per battle). This saves a Press Turn you would've needed to spend on casting Tetraja.

Colors

• Clear for the fusibles ruleset. The other colors don't offer anything useful for a Light build.

Skill Transfer

• Skill priority from greatest to least damage is: White Slash (Underside) > Thunderclap (Underside) > Thunderclap > Hamadyne > White Slash > innate Hamaon.
  • However, using White Slash (Underside) or Thunderclap (Underside) is risky, as their AOE might kill the Chatterskulls before Nidhoggr. Due to this, single-target attacks are preferred for consistency.

Brands

• MATK% Spell, if using a magic-based attack.
• PATK% War, if using a strength-based attack (such as White Slash)
• Due to her MP discount, Divine's MP regen is probably not necessary.

Misc notes

• She also has a 150% healing boost, but it isn't very helpful in practice. At level 50, maxed Media heals about 300 HP, while maxed Diara heals about 1400 HP. For comparison, Ixtab and the Chatterskulls deal about 500 damage per hit (with ATK Debuff + DEF Buff, but without Nu/Dr/Rp's 70% reduction), so Arianrhod's innate healing skills are unlikely to make a big difference. Stick with your healing items.
• She must be alive at the start of a turn in order to grant Evade Mortal.

Jack Frost

Jack Frost (Underside) effect overview

• Self gets 15% Ice/Light damage, and Concentrate (2.25x damage) on his first action - together, these are 87% damage on average across his 2 actions on the first turn. Also gets 50% HP and immunity to Spirit Chains of Suppression.
• If an ally uses an Ice/Light skill, Jack Frost automatically casts ATK Buff (up to 3 times per turn).

Colors

• Clear for the fusibles ruleset. It also gives Hama.

Skill Transfer

• Jack Frost does not have any MP discounts, so 7 MP skills such as Thunderclap may be too expensive to cast repeatedly.
  • Thunderclap (Underside) starts at 7 MP, then becomes 6 MP at max level. This is the strongest skill he can use, but the cost of maxing it is very high.
  • However, using Thunderclap (Underside) is risky, as its AOE might kill the Chatterskulls before Nidhoggr. Due to this, single-target attacks such as Hamadyne or the innate Hama are preferred for consistency.
• Clear can level up Hama and transfer a damage booster, but transferring level 1 Hamadyne will do more damage.
• Hama can be leveled cheaply - run Chapter 1 Leveling Quest for Slimes to feed him for skill points, then transfer skill dupes from 2★.

Brands

• MATK% Spell or Divine.

Misc notes

• If using Thunderclap (Underside), then Concentrate only affects the initial hit, not the AoE chain.
• Consider transcending him for skill switches, as that lets him easily swap builds between multiple areas.

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.
  • For limited-time multi-fusions, only the ones that are currently-available will count.
• Pixie and Slime count, even though you cannot fuse them.

Sample party

Arianrhod Skills Arianrhod (Underside) Thunderclap Brands MATK% Spell Requirements -

Indrajit Skills Elec Amp Elec Boost Brands PATK% Divine or Spell Requirements -

Anat Skills Serial Killer Elec Boost Brands MATK% Divine or Spell Requirements -

Izanami Skills Maziodyne Elec Boost Brands MATK% Divine or Spell Requirements -

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

Team notes:

• If you don't have Arianrhod, put Tetraja on your fastest unit, so you can cast it ASAP.
• Anat: Deals a lot of AoE Elec damage, plus Thunderstorm applies ATK Debuff and DEF Debuff.
  • The Spirit Chains of Suppression prevent Anat from wasting her Concentrate on her random-hit chain effect, meaning she can use it to spam every second Thunderstorm instead.
• Anat and Izanami both boost the team's Elec damage, and grant a total 2 MP discount for the team's Elec skills.
• 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.
• Despite Arianrhod's Light damage aura, this sample party goes for mostly Elec, since it can more-safely AoE everything down.

Other options worth considering:

• Michael: 183 magic, P2 has 30% Light damage. However, Soul Judgement's random targeting can be a problem if it kills a Chatterskull too soon. Consider using him in Red for Thunderclap, or transferring Hamadyne.
• 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.
• Jack Frost (with Jack Frost (Underside) skill): 179 magic, has 15% Light damage and a Concentrate once (87% damage on average across 2 actions on first turn). Automatically casts ATK Buff multiple times per turn. Clear has innate Hama, but transferring Hamadyne is recommended.
• Anubis: 217 magic, Purple has Merciless Blow. Transfer Hamadyne + Light Boost.
• Titania: 235 magic, Purple has Back Attack. Transfer Hamadyne + Light Boost.
• Lailah: 206 magic, has Light Boost. Hamadyne and Mahamaon. Needs Resist Dark.
• Sleipnir: 172 magic (p1), has Light Boost, P2 has 5% damage. Hamadyne and Mahamaon.
• Principality: 195 magic, Purple has Light Boost. Hamaon. Needs Resist Dark.
• Sandalphon: 170 magic (p1), P3 has 10% damage. Hamadyne and Mahamaon. Null Dark for 30% Dark damage reduction.

Race challenges

Holy, Megami, Deity

Team restrictions:

Difficulty	Restriction
Lv 3-5	All 5 demons must be of the races Holy, Megami, Deity, Herald, or Kishin.
Lv 6-8	All 5 demons must be of the races Holy, Megami, Deity, or Herald.
Lv 9+	All 5 demons must be of the races Holy, Megami, or Deity.

Sample party

Arianrhod Skills Arianrhod (Underside) Thunderclap Brands MATK% Divine or Spell Requirements -

Zeus Skills Elec Survivor Elec Boost Brands PATK% Divine or War Requirements -

Anat Skills Serial Killer Elec Boost Brands MATK% Divine or Spell Requirements -

Izanami Skills Maziodyne Elec Boost Brands MATK% Divine or Spell Requirements -

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

Team notes:

• If you don't have Arianrhod, put Tetraja on your fastest unit, so you can cast it ASAP.
• Zeus: Pushes a lot of single-target Elec damage on Nidhoggr. Also has Null Dark for 70% damage reduction.
• Anat: AoE Elec damage with Thunderstorm, which also applies ATK Debuff, DEF Debuff, and Concentrate. If panel 2, also gives a 10% Elec damage aura and -1 MP cost of Elec skills for the team.
• Izanami: AoE Elec damage, and a team Elec damage aura (20% if Panel 3, 10% if not). If panel 4, she also discounts the team's Elec skills by 1 MP. Also has Drain Dark for 70% damage reduction.
• 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.
  • Her weakness to Dark is covered, to ensure the team survives Ixtab's first turn and then kills her on your second turn.
• At higher levels, note that this team can kill Nidhoggr with AOEs without killing the Chatterskulls. Once you've reached this point, it is not necessary to cast Tetraja on the first turn (since the skulls will not die), so you can squeeze in some more damage instead. Make sure to cast it on your second turn when you do expect the skulls to die, though.

Other options worth considering:

• Odin A: Strong Elec attacker that applies Zenith and Gloom, as well as boosts the team's Elec damage, crit damage, and crit rate. However, note that his effect to prevent spending a press turn won't work, and he cannot gain boost levels on his skill while under Spirit Chains of Suppression.
• Cleopatra: Good single-target Light damage, and applies Spirit Chains of Corrosion to reduce the bulk of all enemies. However, she will need a Resist Dark transfer.
• Vishnu A: AoE Light damage. Also has Null Dark for 70% damage reduction. A small caveat is that his automatic Dark AoE will be repelled back at him, but it doesn't hurt very much.
• Artemis: Good single-target Elec damage.
• Norn: 193 magic, has Merciless Blow. Automatic cast of Luster Candy, and can do decent damage if given a Light or Elec transfer.
• Sleipnir: 172 magic (p1), has Light Boost, P2 has 5% damage. Hamadyne and Mahamaon.
• Sphinx: 210 magic, p3 has 10% light damage. Mahamaon and Ziodyne. Needs Resist Dark.

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.

Sample party

Arianrhod Skills Arianrhod (Underside) Thunderclap Brands MATK% Divine or Spell Requirements -

Sukuna-Hikona Skills Light Boost 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 -

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

Team notes:

• If you don't have Arianrhod, put Tetraja on your fastest unit, so you 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.

• 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.
• Jack Frost (with Jack Frost (Underside) skill): 179 magic, has 15% Light damage and a Concentrate once (87% damage on average across 2 actions on first turn). Automatically casts ATK Buff multiple times per turn. Clear has innate Hama, but transferring Hamadyne is recommended.
• Anubis: 217 magic, Purple has Merciless Blow. Transfer Hamadyne + Light Boost.
• Titania: 235 magic, Purple has Back Attack. Transfer Hamadyne + Light Boost.
• Lailah: 206 magic, has Light Boost. Hamadyne and Mahamaon. Needs Resist Dark.
• Sleipnir: 172 magic (p1), has Light Boost, P2 has 5% damage. Hamadyne and Mahamaon.
• Principality: 195 magic, Purple has Light Boost. Hamaon. Needs Resist Dark.
• Sandalphon: 170 magic (p1), P3 has 10% damage. Hamadyne and Mahamaon. Null Dark for 30% Dark damage reduction.

Hell's Park Underside
Area	Phys	Fire	Ice	Elec	Force	Light	Dark
Spike Hell	-	Spike Hell (Fire)	-	-	Spike Hell (Force)	-
Kawara	Kawara (Phys)	-	-	-	-	-	-
Grave	-	-	Grave (Ice)	-	-	-	-
Sanzu River	-	-	-	-	-	Sanzu River (Light)	Sanzu River (Dark)
Blood Pond	-	-	-	Blood Pond (Elec)	-	-	Blood Pond (Dark)
Hell Cafe	-	Hell Cafe (Fire)	-	-	Hell Cafe (Force)	-	-
Burning	-	-	-	Burning (Elec)	-	-	-