Mutilate II is one of Jacob's three exclusive skills and makes him the stronger brawler. It needs level 5 and Mutilate I.
Mutilate II sits at position 16 of 18 in the Combat tree. Unlocking Mutilate II takes 4 skill points. You need level 5 and Mutilate I before you can buy it. Mutilate II is one of Jacob's three exclusive skills, so Evie cannot take it.