Formulas
Contents
Datamined Formulas
All results are floored (rounded down to nearest INT).
The constants included in the following formulas are subject to change.
All chance based results are clamped to lie between 0 <= CHANCE <= 100.
Some formulas have not been updated yet and as such should be taken with a grain of salt. (Currently updated: Crit chance, Accuracy, Ailment Chance)
HP = VIT * 4.7 + LVL * 7.4 PATK = STR * 2.1 + LVL * 5.6 + 50 MATK = MAG * 2.1 + LVL * 5.6 + 50 PDEF = VIT * 1.1 + STR * 0.5 + LVL * 5.6 + 50 MDEF = VIT * 1.1 + MAG * 0.5 + LVL * 5.6 + 50
DAMAGE FORMULA = (ATK * 1  DEF * 0.5) * 0.4 * (SKILL POWER * (1 + % SKILL DAMAGE MODIFIERS FROM SKILL LEVELS) / 100) * (1 + % DAMAGE MODIFIERS) * (1 + TARUNDA/TARUKAJA  RAKUNDA/RAKUKAJA) * (CHARGE / CONCENTRATE: 2.25 or 2.75 w/ Templar Dragon) * (CRIT/WEAKNESS/RESIST) 10% variance in final damage. Critical hit multiplier is 1.5x Weakness hit multiplier is 1.5x Resistance hit multiplier is 0.7x
HEALING FORMULA = (MATK * (HEAL POWER * (1 + % HEALING MODIFIERS FROM SKILL LEVELS) / 100) * HEALING_CONST + MIN_HEAL_VAL) * RANDOM_HEA_VAR * (1 + % HEAL MODIFIERS)
kaja/kunda effects (applied at end of formula) Rakukaja: 0.17 = 0.83x damage taken Tarunda: 0.2 = 0.8x damage taken Rakukaja + Tarunda: 0.37 = 0.64x damage taken Tarukaja: +1.2 = 1.2x damage dealt Rakunda: +1.25 = 1.25x damage dealt Tarukaja + Rakunda: 1.45 = 1.45x damage dealt
USER INFLICTION BOOST = AILMENT INFLICT PASSIVES + BRAND AILMENT INFLICT + AILMENT INFLICT FROM SKILL LEVELS + AILMENT INFLICT PANELS ENEMY AILMENT RESISTS = AILMENT RESIST PASSIVES + BRAND AILMENT RESISTS + AILMENT RESISTS PANELS + Dx2 AILMENT RESISTS SKILLS + CURRENT AILMENT RESIST BUFFS MINIMUM AILMENT CHANCE = floor(SKILL AILMENT RATE * 0.3) AILMENT CHANCE = floor(SKILL AILMENT RATE + ((USER LUCK  ENEMY LUCK) * 0.3)) + USER INFLECTION BOOST  ENEMY AILMENT RESISTS Some demons may have some innate ailment resistances (likely PvE only), modifying the above AILMENT CHANCE: AILMENT CHANCE = floor(AILMENT CHANCE * ((100  DEMON AILMENT RESISTS) / 100)) It will use the greater of either MINIMUM AILMENT CHANCE or AILMENT CHANCE to determine the chance of an ailment being successful.
TEMP ACCURACY = BASE SKILL ACCURACY * (FUNCTION1(USER AGI  ENEMY AGI) + FUNCTION2(USER LUCK  ENEMY LUCK)) * (1 * SUKUNDA/SUKUKAJA) FINAL ACCURACY = TEMP ACCURACY + ACC BRANDS + ACC SKILLS  EVASION BRANDS  EVASION SKILLS MINIMUM ACCURACY = 100 * BASE SKILL ACCURACY * 0.2 There is a minimum hit chance, and it will take either MINIMUM ACCURACY or FINAL ACCURACY depending on what's higher.
LUCK DIFF = USER LUCK  ENEMY LUCK CRIT LUK VALUE = 20 if LUCK DIFF >= 30, 15 if LUCK DIFF >= 20, 10 if LUCK DIFF >= 10, 0 if LUCK DIFF >= 0, 10 if LUCK DIFF < 0 CRIT CHANCE = CRIT LUK VALUE + BASE SKILL CRIT CHANCE + PASSIVE SKILLS/PANEL CRIT CHANCE + CRIT BRANDS  ENEMY CRIT REDUC SKILLS/PANEL + Dx2 CRIT SKILL BASE SKILL CRIT chance seems to be 0 or 10 on phys skills which don’t list their crit rate in their description
Counter Chance is rolled sequentially and separately, starting from the highest tier Counter first (Death Counter>Retaliate>Counter) regardless of slot order.
Party speed is calculated first at an individual demon level then at a party level. INDIVIDUAL DEMON SPEED = (DEMON AGILITY + SKILL AGILITY + MITAMA AGILITY) * ((SKILL SPEED PERCENT + BRAND SPEED PERCENT + PANEL PERCENT) / 100) PARTY SPEED TOTAL = INDIVIDUAL DEMON SPEED TOTAL / PARTY COUNT (It's an average)
Ailment Recovery Chance (WIP)
These values do not account for ailment recovery passives such as Fast Recovery and Epic Recovery and Dx2 ailment recovery modifiers.
Note: Curse and Weak recovery chances need verification

Poison Turn 1 0% Turn 2 0% Turn 3 25% Turn >= 4 50% 
Bind Turn 1 25% Turn 2 50% Turn 3 70% Turn >=4 100% 
Charm Turn 1 25% Turn 2 50% Turn 3 70% Turn >=4 100% 
Mute Turn 1 0% Turn 2 15% Turn 3 50% Turn >=4 75% 
Curse Turn 1 0% Turn 2 0% Turn 3 0% Turn >=4 Recovered (100%) 
Weak Turn 1 0% Turn 2 0% Turn >=3 Recovered (100%)
More On Accuracy
Functions
As written above Accuracy uses some FUNCTION 1 and 2 which respectively takes the difference between the AGI and the difference between LUK. (Notation: DIFF_AGI and DIFF_LUK)
FUNCTION1(DIFF_AGI) is:
 102 if DIFF_AGI >= 256
 100 if DIFF_AGI >= 40
 98 if DIFF_AGI >= 30
 96 if DIFF_AGI >= 20
 94 if DIFF_AGI >= 10
 92 if DIFF_AGI >= 0
 88 if DIFF_AGI >= 20
 84 if DIFF_AGI >= 40
 80 if DIFF_AGI >= 60
 76 if DIFF_AGI >= 256
FUNCTION2(DIFF_LUK) is:
 13 if DIFF_LUK >= 256
 11 if DIFF_LUK >= 30
 9 if DIFF_LUK >= 20
 7 if DIFF_LUK >= 10
 5 if DIFF_LUK >= 0
 0 if DIFF_LUK >= 30
 5 if DIFF_LUK >= 256
In a nutshell, every 10 AGI or LUCK points are worth 2% Accuracy/Evasion on average (i.e. 1 point = 0.2%). But we have some cap on AGI and LUCK impact on Accuracy. Beyond a difference of 30 LUCK points or 60 AGI points between the attacker and defender, you will not be getting better return.
And the base Accuracy when DIFF_LUCK and DIFF_AGI are near 0 is 88 to 97, depending if DIFF_LUCK/AGI >=0.
Base Skill Accuracy
As shown in the Formula, skills have base accuracy. Normal Attack is 1.0 base accuracy (i.e 100%).
NONPHYS SKILLS WITH IRREGULAR ACC (non 0):
 Amakusa Uprising: 1
 Barbed Spear: 1.1
 Slaughter All: 1
 Third Eye: 1
 Vengeful Frost Fist: 1
PHYS SKILLS WITH IRREGULAR ACC (non 1):
 Lunge: 0.95
 OniKagura: 0.95
 Mortal Jihad: 0.95
 Mow Down: 0.9
 Herculean Strike L: 0.9
 Herculean Strike: 0.9
 Hades Blast: 0.9
 Vorpal Blade: 0.9
 Gigantomachia: 0.9
 Earthquake: 0.9
 Heat Wave: 0.85
 Megaton Press: 0.85
 Titanomachia: 0.85
 Blight: 0.9
 Rampage: 0.9
 Deathbound: 0.9
 Madness Nails: 0.9
 Myriad Arrows: 0.9
 Nihil Claw: 0.9
 Tempest Slash: 0.9
 Violent Slash: 0.95
 Beloved Slash: 0.9
 Million Stab: 0.9
 Gungnir: 1.3
 Gomorrah (J): 0.9
 Hell Claw: 0.9
Chain Effect/Passives:
 Enemy Annihilation: 0.9
 Heavenly Valor: 0.85
 Dragon Blade's chain effect: 1.0
 Terror of London: 0.9
 Yaksha Claw: 0.9
 Bloodshed: 0.9
Enemy Exclusive Skills (non 1 for phys or non 0 for elemental):
 Dragon Flare: 1
 End Realm: 1.5
 Mad Ice Sword: 1.1
 Maragidyne (Physical): 1
 Dragon Tooth: 0.8
 Megaton Press+: 1.1
 Mutilation: 1.2
Basically, phys skills get 10% accuracy for being AOE or Random Target and 5% for having increased crit rate (15% if both). Unique skills do not necessarily follow this pattern (Ouas is 1 despite high crit, Gungnir is 1.3 etc.)
Verification
Experimental Data
Someone tried to experimentally determine the formula in March 2019 https://gameburio.hatenablog.com/entry/2019/03/01/014016
The formula he got are not very good, but he did publish the experiments: 6 of them
Each experiment is just 1 Brandless Demon using Normal Attack on another Brandless Demon 200 times, then calculating the Hit Rate in %. We can use the results and compare them with our own Formulas.
He does this for 6 different pairs of Demons.
USER AGI  ENEMY AGI  USER LUK  ENEMY LUK  DIFF AGI  DIFF LUK  FUNCTION1  FUNCTION2  EXPERIM(%)  THEORY(%)  

EXP1  153  208  169  188  55  19  80  0  81  80 
EXP2  152  208  132  188  56  56  80  5  71  75 
EXP3  61  208  166  188  147  22  76  0  75  76 
EXP4  94  208  64  188  114  124  76  5  65  71 
EXP5  94  112  64  138  18  74  88  5  80  83 
EXP6  153  112  132  138  41  6  100  0  100  100 
Analysis
Related to the experiments. (Take into account that the Standard Deviation should be about 2% to 3%.) We can see whenever DIFF LUK is very low our prediction is too high by quite a large margin (EXP2, EXP4 and EXP5).
It may only be some statistical error. Either way if you ever do some experiments to test the different hypothesis, please feel free to post them on this wiki, on the subreddit or on the Dx2 Discord.