Hitting at least 3 enemies with an attack, increases your damage by 24-36% for 3 seconds.
2.5-4% Bonus Critical Chance on Chained Hit. Stacks 5 times.
4.25-5% Strength for every Enemy you Stagger. Stacks 5 times.
3.5-5% Critical Chance for every 10% of magazine spent during continuous fire. Stacks 5 times.
Eviscerator for hordes, ogryns, monsters.
Shredder for elites/specials at close/mid range (esp close range to get max benefit from Annoint in Blood).
Knives for long range.