How do i make a sword deals 50% extra damage to undead mobs?

on procedure "Entity Attacked with Item "or smt like that

if event target entity is UNDEAD

 do deal (DAMAGE + 50%) to event target entity

Hey yo, fine? Don't know if you still figuring out how to do that but it's very simple.

First, create a new procedure and make it to be equal to mine:

Then, go to your item, and edit it, go to the "Triggers" tab and select you procedure on "When living entity is hit with tool" and select your procedure.

For now you wont be able to calculte a percente like 50% damage on the procedure, so you will need to make it manually and then set the damage value on the procedure, you can create one procedure for each tool, or only one for all, like in my mod.