5-8% toughness on Chained Hit.
Hitting at least 3 enemies with an attack, restores 12-15% toughness.
1-4% Toughness for every 10% of magazine spent during continuous fire. Stacks 5 times.
Hitting an enemy with the special attack gives them 10-16 stacks of 2.5% Brittleness. Debuff lasts for 5 seconds and can have a maximum of 16 stacks.