Drug Dealer
 Hive Scum Build - Warhammer 40k: Darktide 

Idea of the build is to support and buff your team. Give them a bunch of strength, rending, and a bit of attack speed. Cleaver is good for hordes and applying toxin to a lot of enemies. The corruption removal and protection is also pretty nice for modifiers like the Blight Spreads and protecting your team from getting one shot by things like Crushers from corruption.

I have my stimm cooldown lower than the Stimm Supply cooldown because having my stimm ready makes Stimm Supply immediately usable. This also makes ability cooldown on your curios basically useless, as the only cooldown I care about is stimm cooldown. Chemical Dependency does not work using your stimm with Stimm Supply and you are never using your stimm the regular way. Even if Chemical Dependency worked with Stimm Supply, it still probably still not be worth it since I don't care about ability cooldown or crit on this build. This made Adrenaline Frenzy the best keystone pick for a Stimm Supply build. 

I use the needle pistol mark that applies some chem toxin to enemies in an AOE as well as I just want things to have  some amount of chem toxin when they die for Sample Collector. Also whatever aura works fine in this build.

Edit: Updated for when the talent tree got broken and what I have been running on my stimm lately. I find with this stimm at around 30 seconds cooldown then as long as you are killing enemies and cleaving hordes you can maintain the stimm supply buff constantly. When you use a grenade your stimm often comes cooldown off before the previous buff runs out too. They also made it so Chemical Dependency works with Stimm Supply now but I still don't think it is worth it for this build.