Hitting an enemy gives them 1-4 stacks of 2.5% Brittleness. Debuff lasts for 5 seconds and can have a maximum of 16 stacks.
Target receives 1-4 Stack(s) of 10% Damage if already Staggered. Lasts 5s.
Your Grenades stick to Ogryns and Monstrosities. 6-15% Damage vs Ogryns and Monstrosities
5-8% Strength for every shot fired during continuous fire. Stacks 5 times.
Replace thunderus for confidence strike if you want
Blazeaway with shrapnel if you want
Can you rock if you want but harder to actually stack skullcrusher on bosses
Combo
Thrownade where boss will be going, to stagger it (can be skipped if boss is booked/shouted/barreled and stops it for moving.) Hit twice with bully club to stack 8 skull crusher. Switch to unloaded rumblr, taunt shoot until you have to reload and go melee