I've been looking around for skills/weapons that do this and I have found Trickster's bag of skill effects, unfortunately it doesn't seem to work on weapons and is also incompatible with some other, more necessary scripts I have.
Is there a script in existance to make it so that you can apply an element to a weapon/skill and it will absorb the damage it does as HP/SP to the attacker?
Is there a script in existance to make it so that you can apply an element to a weapon/skill and it will absorb the damage it does as HP/SP to the attacker?