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.
Target receives 1-4 Stacks of 2.5% Brittleness on direct projectile hit. Debuff lasts for 5 seconds and can have a maximum of 16 stacks.
10% Critical Chance for every 0.2-0.35 second while aiming. Stacks 10 times. Discharges all stacks upon firing.
Tigris Eviscerator light swings are horizontal for amazing horde clear. Fury boosts your attack speed for 10 seconds. Blazing Piety, Shred & Scourge gives you a ton of crit, and crits reduce cooldown of Fury. So just Fury into a horde, spam lights to mulch them into red mist, and you'll get a charge of Fury back in a few seconds, so you can just spam Fury all the time. You get toughness regen when you use Fury and 50% toughness damage reduction when you land your first Fury hit because it's guaranteed to be a crit. Rampage is better for overall damage. (Perfect Strike is also good as it gives full cleave through all enemy types, including armored, but you can only damage 4 targets max.)
For elites/mutants use the heavy overhead. 2-shots mutants and scab ragers to the body, dreg ragers take 3 body shots but only 2 if hit head.
For carapace/ogryns/monsters use the Bolter or hit them with Revved Heavy to the head then hit Fury after connecting (for some reason does more damage if Fury after hitting - one shots crushers this way but doesn't one shot if you Fury first).
Throwing knives for specialists.