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.
1-4% to Instakill human-sized enemies on Chained Heavy Hit. Stacks 5 times. Note that other potential triggers will not be activated on Instakill.
30-42%Melee Strength for 3.5s on Hitting 3+ Enemies with a Ranged Attack.
18-30% Strength for 5s when every pellet in a shot hits the same enemy.
This build breezes through everything. find myself getting bored on aurics. kickbacks melee attack counts as heavy attack and also comes out very fast. which gives you back 25% toughness with each hit and surrounds you with bleeding enemies. blast in then get 42% more melee damage. with base 30% toughness damage reduction and how easily you get back toughness this build branches out into being tanky and hard hitting better than any other build i've used and you're guaranteed to be the last man standing. FYI slaps count as light attacks and have massive cleave, all while they also refresh heavy hitter while stunlocking virtually every enemy in the game, applying 20% brittleness, and 15% more damage taken. its the ultimate utility. plus its really really funny. im stuck with haymaker on mine, take whatever you want really. all i really do is chain heavy attacks so it procs a decent amount for me. it has been clutch a few times as it can one shot mutants. if you want the last keystone just remove a +15 toughness node and take it, either works.