Savage Overkill

When you somehow brutalize your kill, you deeply intimidate the rest of your foes.
The Brute rolls Strength & Intimidation once, resisted by the Will & Control of each enemy that saw the horrific event, as described in Horror, and all who fail roll for an horror effect as described in the article.
You must state exactly what you do, be graphic and fucked up.
Perhaps your last killing blow left your nearby enemies covered in pieces of the brain of their former friend, or you kept on insanely chopping body parts out of your enemy after dead, or you take an afternoon to carefully peel the face out of the skull of your enemy, and you make yourself a mask with it.