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.
Up to 5-20% Strength based on the charge time of your heavy attacks. Stacks 3 times.
18-30% Strength for 5s when every pellet in a shot hits the same enemy.
30-42%Melee Strength for 3.5s on Hitting 3+ Enemies with a Ranged Attack.