Gandalf's 'Inferno Reborn' Shriek
 Psyker Build - Warhammer 40k: Darktide 

The most bread and butter Inferno build out there. Shriek for 6 stacks of immediate soulblaze (at high peril), In Fire Reborn for constant Warp Siphon Generation, Kinetic Flayer for free Perilous Combustion kills before things start dropping on their own. And a Warp Flurry/Blaze Away Inferno Staff constantly pumping out up to 50-60% charged flame breaths that keep Blaze Away active for high burning damage. 

Constant toughness with Essence Harvest, constant abilities with Warp Siphon and Psykinetic's Aura, and even a decent bit of DR and damage as Peril climbs. You get everything with this build, only 'issue' is not having that 5% crit, but it's well worth keeping the toughness around (to me at least). 

You also don't get Empathic Evasion, but that's what Deflector is for on the greatsword. The Greatsword is also a good swap to for Carapace enemies when needed, or as a spacing tool if things get to close. Otherwise, just burn everything to the ground, and laugh manically while doing it...for your beloved.