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Battle Formulas
RPGXP's default battle system uses the following formulas.

The active battler is represented by A, where the battler who is the target for A's actions is represented by B.

First Hit
Normal attacks:
First hit rate = Hit rate of A's state
Skills:
Attack power F is 1 or greater (physical attack)
First hit rate = Skill's hit rate × hit rate of A's state ÷ 100
Attack power F is 0 (non-physical attack)
First hit rate = Skill's hit rate
Items:
First hit rate = Item's hit rate

• If A's condition is normal, the state hit rate is 100.

Critical Hit
Normal attacks:
Critical hit rate = 4 × A's dexterity ÷ B's agility
Skills:
Critical hit rate = 0
Items:
Critical hit rate = 0
Calculating Damage
Normal attacks:
Power = A's attack power - (B's physical defense ÷ 2)
Rate = 20 + A's strength
Variance = 15

• Minimum force: 0

Skills:
Skill's force is positive:
Force = Skill's force

+ (A's attack power × skill's attack power F ÷ 100)

- (B's physical defense × skill's physical defense F ÷ 200)

- (B's magic defense × skill's magic defense F ÷ 200)

• Minimum force: 0

Skill's force is negative:
Force = Skill's force
Rate = 20

+ (A's strength × skill's strength F ÷ 100)

+ (A's dexterity × skill's dexterity F ÷ 100)

+ (A's agility × skill's agility F ÷ 100)

+ (A's intelligence × skill's intelligence F ÷ 100)
Variance = Skill's variance
Items:
HP recovery amount is negative:
Force = - Amount of HP recovered

- (B's physical defense × item's physical defense F ÷ 20)

- (B's magic defense × item's magic defense F ÷ 20)

• Minimum force: 0

HP recovery amount is positive:
Force = - Amount of HP recovered
Rate = 20
Variance = Item's variance
Damage = force × multiplier ÷ 20 × elemental modifier × critical modifier × defense modifier (± variance %)

• Elemental modifier: The weakest of B's effective elements corresponding to the action's element(s).
  A: 200%, B: 150%, C: 100%, D: 50%, E: 0%, F: -100%
  Reduced by half if B's armor or state has a defending (opposing) element.
  When there are more than one of the same defending elements, the damage may be halved multiple times.
• Critical modifier: Equals 2 when the damage is positive and a critical hit is made.
• Defense modifier: Equals 1/2 when the damage is positive and B is defending.

Second Hit
Damage is positive:
B's condition is normal:
Evasion = 8 × B's agility ÷ A's dexterity + B's evasion modifier
Normal attacks:
Second hit rate = 100 - evasion
Skills:
Second hit rate = 100 - (evasion × skill's evasion F ÷ 100)
Items:
Second hit rate = 100
B has "Can't Evade" state:
Second hit rate = 100
Damage is negative (recovery):
Second hit rate = 100
Successful Escape
Successful escape rate = 50 × actors' average agility ÷ enemies' average agility