Speed Demon - Crit Everything - Burn Em
 Zealot Build - Warhammer 40k: Darktide 

I've been running this in Auric Quickplay and Auric Maelstroms with great success, I can count on one hand how many times I've died in the last 2 days, you are simply a speed demon

Targeting weak points isn't necessary unless its a larger enemy, Go fast stabbing everything in the back and if there is too many elites pop shroudfield to easily kill the biggest threat to you whilst you use Master-Crafted shroudfields -75% threat and extra backstab damage to clear as many priority targets as possible. 

Your dodge is insanely powerful to the point of going into minus dodges and still being effective. Taking advantage of the new found mobility is your best course of action, so long as you don't get totally backed into a corner without shroudfield you are pretty unkillable.

If you need to stop a push from a choke-point or reduce the overwhelming amount of horde in front of you then pull out the flame and make use of the throwing knife during its pullout animation to equip it quicker and burn those heretics with great satisfaction. 

For the Blade, punch into heavy stab is good for single targets and you can just light spam all the minor mobs and if it's a priority target use your heavy and target weakspots for quicker kills although not totally necessary since you can kill quickly even without hitting weakpoints. 

When shit inevitably hits the fan you can quickly rescue teammates from danger, when someone gets netted you are quick enough to pull the net off them before they can blink (hyperbole), both reviving and rescuing is nothing for you since you can rely on shroudfield to do it safely but it's not all that necessary given your speed. I normally pop shroudfield if there's something dangerous like a crusher/mauler nearby or a disabler like trappers and dogs, if it's getting crowded it helps then too but be careful you don't endanger someone squishy when you drop aggro and have the whole room target the only other person alive.