counterattack with twice the strength of the attack.

https://imgur.com/a/m1rheZ1

here. make a new procedure change the trigger to entity attacked and go to the bottom right side next to the trashcan and you can find "amount". amount is the damage that will be dealt to you. you can find cancel trigger at advanced. or just make what the procedure is and its done

you can also add STRENGH effect for the next attack for a short amount of time. 

(way better since it adds flat damage and will not probably double attacks from 50 damage from other mods)