you get it done by understanding the way the damage calculation works,
and than you can at least edit it and change the attack damage amount .
QE.
melee attack ,
at the very first line of the damage calculation void the damage = 0;
and than
damage = random (Attacker.MaxAttack, Attacker.MinAttack);
damage += attacker.str;
damage += Attacker.BattlePower * Attacker.BattlePower / 50;
if (Attacker.stigged) damage = (damage * attacker.stiglevel extra attack percent)
if (Attacker.SuperMan) damage = (damage * 1.8);
if (damage > Target.BattlePower * target.BattlePower / 50)
damage -= Target.BattlePower * target.BattlePower / 50; else damage = 1;
if (damage > 1 && damage > Target.defense) damage -= target.Defense; else damage = 1;
if(damage > 1 && Target.Shielded) if (damage > Target. ShieldLevel extra defense percent) damage-= Target.shieldlevel extra defense percent
etc etc
that was just a quick example,
and to recalculate the whole thing you have to start from the Equip/Unequip void and make sure that the right item status is being added nothing extra nothing less ,
Ps. (case: Lotf)abandoning that source is strongly recommended as it never been calculated the way it should and its crappy
Good Luck ,