Damage Formula/Summary Table

DMG Formula	Parts
Phys (PWR/ATK)	( Base Damage X Elemental Modifier + Damage Spread) X Resistance X Skill Multiplier X Other Multipliers
Phys (SPD/ATK)	( Base Damage X Elemental Modifier + Damage Spread) X Resistance X Skill Multiplier X Other Multipliers
Phys (INT/M.AT)	( Base Damage X Elemental Modifier + Damage Spread) X Resistance X Skill Multiplier X Other Multipliers
Magical	( Base Damage X Elemental Modifier + Damage Spread) X Resistance X Skill Multiplier X Other Multipliers
Magical (PWR/ATK)	( Base Damage X Elemental Modifier + Damage Spread) X Resistance X Skill Multiplier X Other Multipliers

Summary of Damage Sources

Table translated from CSDN
The table below shows how various sources affect damage. "Skill" refers to buffs/debuffs that are caused during battle, while "Equip" refers to equipment buffs, such as from Weapons, Armor and Grasta. This table does not include the effects of character stats as seen on the character status screen.

Damage Source	Physical				Magical			Etc.
	PWR-dependent	INT-dependent	SPD-dependent	Weakness modifier	INT-dependent	PWR-dependent	Weakness modifier	Fixed	Poison	Pain
PWR Buff/Debuff (Skill)	✓	×	×	×	×	✓	×	×	×	✓
INT Buff/Debuff (Skill)	×	✓	×	Hover to view note INT Buffs/Debuffs affect Weakness Mod of PWR and INT-dependent Physical attacks only. SPD Buffs/Debuffs affect Weakness Mod of SPD-dependent Physical attacks only	✓	×	×	×	✓	×
SPD Buff/Debuff (Skill)	×	×	✓	Hover to view note INT Buffs/Debuffs affect Weakness Mod of PWR and INT-dependent Physical attacks only. SPD Buffs/Debuffs affect Weakness Mod of SPD-dependent Physical attacks only	×	×	×	×	×	×
Normal attack UP (Equip)	✓	？	？	×	✓	？	×	×	×	×
Critical Rate UP (Skill/Equip)	✓			×	×		×	×	×	×
Magic Critical Rate UP (Skill/Equip)	×			×	✓		×	×	×	×
Critical Damage UP (Skill/Equip)	✓			×	×		×	×	×	×
Magic Critical Damage UP (Skill/Equip)	×			×	✓		×	×	×	×
Null/Type Damage UP (Skill/Equip)	See below			×	See below		×	×	×	×
Type Resistance Buff/Debuff (Skill/Equip)	See below			×	See below		×	×	×	×
Physical Resistance Buff/Debuff (Skill/Equip)	✓			×	×		×	×	×	×
Barrier (Skill)	✓			×	✓		×	×	×	×
Weapon Damage UP (Skill)	✓			×	✓		×	×	×	×
Pain/Poison Grasta/Max HP (Skill/Equip)	✓			×	✓		×	×	×	×
Pain/Poison/Rage/Bind Enh, Rose with Thorns, Last Stand, Weak Point, Bullseye/ Ally Defeated DMG+ (Equip)	✓			×	✓		×	×	×	×
Mental Focus (Skill)	×			×	✓		×	×	×	×
Eagle Eyes/Overthrow/ Multihit (Skill)	✓			×	✓		×	×	×	×
Break (Skill)	✓			×	✓		×	×	×	×
Adversity/Lunatic - Risktaker (Skill)	✓			×	✓		×	×	×	×
Lunatic - Mind's Eye (Skill)	✓			✓	✓		✓	×	×	×
Weakness Mod UP (Skill)	×			✓	×		✓	×	×	×
AF Combo%	✓			×	✓		×	×	×	×
Zone / Song (skill)	✓			×	✓		×	×	×	×
Another Zone (skill)	✓			×	✓		×	×	×	×
Field Effects	✓			×	✓		×	×	×	×

Type Buff\Debuff Table

The following table shows how various type damage and resistance buff and debuffs affect various attacks.

Element Type	Elemental Physical	Null Physical	Elemental Magical	Null Magical
Null element damage UP (Skill/Equip)	×	✓	×	✓
Specific element damage UP (Skill/Equip)	✓	×	✓	×
Type damage UP (Skill)	✓	✓	✓	✓
Type damage UP (Equip)	✓	×	✓	×
Specific element resistance buff/debuff (Skill/Equip)	✓	×	✓	✓
Type resistance buff/debuff (Skill/Equip)	✓	×	✓	✓