Pyromancer (Brain Rupture, Scrier's Gaze, Disrupt Destiny)
 Psyker Build - Warhammer 40k: Darktide 

The idea is to apply Soulblaze to as much as possible to further increase crit chance and toughness generation. This is accomplished either through simply critting while cutting through hordes with the sword or by blasting them with the Voidblast/Trauma staff's charged attack. Killing specialists and elites also spreads Soulblaze, so it's generally pretty easy to spread the stacks around. It's not a particularly strong damage source but it helps give you a way to generate consistent toughness. Anticipation can be swapped with Empathic Evasion, that's entirely a preference thing.

Brain Rupture allows you to reach far-away targets like Snipers while also occasionally providing some extra burst damage versus elites, specialists and bosses. The point in Kinetic Flayer could easily be moved elsewhere without harming the build at all.

As far as the weapons go, I personally like the MKVIII Force Greatsword more than the MKVI. Its light attacks feel better to use, imo, and it still has an enormously powerful stab attack, though it is locked behind doing a force push first. I think that Riposte could be swapped out for Deflector with Block Cost Reduction on the curios, but that's probably not necessary if your positioning is good. The ranged weapon could easily be replaced with a gun (I like both the MKII Heavy Laspistol or the Bolt Pistol for this kind of build) but then I'd swap the point out of Warp Unbound to pick up something else.