New damage calculations

[shucke]

I was wondering if there is a way to change the damage calculations whitouth editing base classes.

i want my armor to add physycal attack to the player which pierces through the armour of the player and deal the damage based on the remaining def that is left.

i dont care if i can't do this with diamond swords or anything.

i just want this to happen with my own custom swords.

so is there a way to do this whitout editing base classes?