secret havoc meta scum
 Hive Scum Build - Warhammer 40k: Darktide 

Your role is to staggerlock, suppress and remove elites and specialists. You are also on corruption healing duty. You can load stimm more if you don't have The Blight Spreads modifier.

You use your Ius Mk IV Shredder Autopistol as much as possible unless you deal with crushers (and only crushers) or are surrounded and need to break out with melee.

We don't have Extra Pouches so if you have a better grenade user, take Blackout. Chem Grenade is still the best blitz in the game, but only if you collect grenade supplies.

Enhanced Desperado is a glorified instant reload button with a really long cooldown that gives you access to +15% rending talent. It is a good talent but sadly it costs you an ability, so we take Improvised Mk I Shivs to fight carapace. Since we don't have Enhanced Desperado instant reload, you will sometimes have to engage in melee with horde. Uncanny Strike is mandatory, second blessing is optional. Use light attacks for horde clear, heavy attacks for carapace, and push often. Like, really often. That's why I take stamina regeneration, but you can replace stamina regeneration with anything else because Regained Posture is good enough by itself, especially if you add a +3 stamina curio. I just don't think you can find anything better than stamina regen in this build. Corruption resistance is good but you heal the corruption so it's kinda unnecessary.

Chemical Dependency is good but not as good as Vulture's Dodge and toughness recovery for your team on Vulture's Mark. It's like veteran's Target Down! except you don't need to ping targets and it always gives 15%. You can keep your team alive in pox gas just by shooting horde.

Ability cooldown regeneration doesn't matter because it doesn't affect stimm cooldown.