I'm pretty sure you're asking if there is any damage hack/mod. No there isn't, only thing that would be considered close to a damage hack/mod, would be dragon meteor and pvp percentage change.
[Release] Fix Archer/Taoist Damage and Huge Thunder/Fire Damage 04/20/2009 - CO2 PServer Guides & Releases - 14 Replies This is what you need to Fix Archer (Skills)/Taoist Damage and Huge Thunder/Fire Damage in LOTF source.
Open Other.cs
public static uint CalculateDamage(Character Attacker, Character Attacked, byte AttackType, ushort SkillId, byte SkillLvl)
Replace the whole method with the following method
public static uint CalculateDamage(Character Attacker, Character Attacked, byte AttackType, ushort SkillId, byte SkillLvl)
{