Fighter/7th/Brute
From Legends of Hyrule
Battle Instinct
From 7th level onward, add your proficiency bonus to your initiative if you don't already.
Brutal Critical
Starting from 7th level, whenever you score a critical hit, you can roll one additional weapon damage die when determining the extra damage for a critical hit with a melee attack. This increases to two additional dice at 11th level, and three at 15th level.