Normal Attacks
Damage = A's attack × 4 - B's defense × 2
If the results of the calculations would be a negative number, it will be made 0.

Skills/Items
If the base damage is a positive number
Damage = Base Damage
 + (A's attack × 4 × Attack F ÷ 100)
 + (A's spirit × 2 × Spirit F ÷ 100)
 - (B's defense × 2 × Attack F ÷ 100)
 - (B's spirit × 1 × Spirit F ÷ 100)

If the results of the calculations would be a negative number, it will be made 0.
If the base damage is a negative number
Damage = Base Damage
 - (A's attack × 4 × Attack F ÷ 100)
 - (A's spirit × 2 × Spirit F ÷ 100)

Of the attributes that accompany this action, the largest of B's attribute effectiveness values is used to modify the result.
A:200%, B:150%, C:100%, D:50%, E:0%, F:-100%
However, if B's armor or state has the [Halve Attributes] effect, these values will be halved.
If there are multiple such effects, they will all be taken into account.
If the normal attack damage would be 0 after attribute effects have been taken into account, there is a 50% chance that the attack will still cause 1 damage.
A critical hit multiplies the damage caused by 3.
If B is defending himself, the damage will be cut in half. If he has a strong defense, the damage will be 1/4 the normal amount.
Damage amounts are random to some extent, as determined by the dispersion settings.