The Scarecrow - Fear Toxin Build
 Hive Scum Build - Warhammer 40k: Darktide 

Crit Toxin Bomber Build "Buyer beware. I told you my compound would take you places. I never said they were places you wanted to go!"

Before the cults, she was a cartel chemist who paid her debts in the underhive's black labs, cutting compounds that didn't just kill, but unmade the mind.

• The Bone Saw -  Solid horde control with sweeping push attacks; light spam is the name of the game here. Think of it like a toxic tac axe aiming at targets' heads to proc Refined Lethality. As a result, cleave is not too much of a concern; your tox-bombs will be your heavy horde-clearing tool. Use purple toxin only on large groups for crushers; the green mixture is the more... lethal option for most threats.
• The Prescription or The Needle Pistol - Your delivery system. Two taps into a crusher, then back to the saw to keep the toxin climbing. When a large creature steps out of the dark (OR the Batman!), this is what you want in your hand. Scavenger also ensures the well of darts never runs dry... no matter how liberally you dose. 
• The Booby Trap Stimm Supply -  Fear isn't something you throw; it's something you leave behind... Very fun to start fights with these Toxbombs to get the fear spreading. Provides solid toughness every 15 seconds due to Chem Fortified and solid stagger also into groups of large enemies. Practiced Deployment and a short cooldown turn every corridor into a minefield for us, and the longer the fight drags on, the less your enemies can trust their own instincts!
• Your Scarecrow Stim - Kept deliberately weak so Practiced Deployment stays on for as short a cooldown as possible, plays well with Chem Fortified, however, as an emergency toughness button when out of position!