Rat Stink Assassin (India Special)
 Hive Scum Build - Warhammer 40k: Darktide 

Rat Stink Assassin build focuses on proccing critical hits in a self-feeding loop using Hyper-Critical & Hyper-Violence. Have fun running around 2 shotting crushers (in melee or ranged your choice). Make sure you are always on 3 stacks of Chemical Dependency . I use Rampage! defensively as it ensures I get kills that proc Toxic Renewal that keeps my toughness at near max. You can also cycle between Rampage! and your stimm so that you are always buffed in some way. Do what you prefer for your play-style. 

Use light swings for hordes, pick off heavy targets with charged melee and hit them in the back. 

Save your Chem Grenade as a free get-out-of-jail card, they are incredibly powerful. 

Additionally make sure you utilize the Branx MkVI Needle Pistol alternate fire (blue) mode for explosion darts that can clear out hordes very well. For monstrosities mag dump full Needle Pistol mag (yellow mode) and swing away with melee. Most specials are dealt with in 1-2 darts. 

You can make whatever stim you want in the Stimm Lab, just be sure to keep the cooldown around 60 seconds. I chose to go with the extra finesse for the shiv damage buff. Attack Speed is also incredibly good.

This build outputs absolutely enormous amounts of DPS with moderate defensive capabilities. Curios are users choice, but some extra health and toughness go a long way.