Battle Psyker
 Psyker Build - Warhammer 40k: Darktide 

This is currently my favorite build in Damnation. It's a good all arounder build that lets you do pretty much everything. You'll probably spend most of your time brain bursting elites and specialists, but when a horde is incoming you shoot those void balls which half the time eliminates the horde before they get to you. If enemies are in close range, switch to your Illisi sword (which is currently an amazing sword… I've used the others and really recommend using this sword). Don't forget to use the special to keep your peril high and do extra damage as well as making use of Kinetic Shield.

I know most people use Essence Harvest or Warp Absorbtion, but I much prefer Quietitude. You'll spend a lot of time at high peril, so it's really easy to step behind a crate or wall or something and quell which quickly restores your toughness. Warp Unleashed and Warp Battery will keep you doing a ton of damage at high peril. Kinetic Barrage is probably more useful than Ascending Blaze with this build as you spend a lot of time Brain Bursting. Quicken isn't bad as it ramps up your damage quicker and lets you spam BB and Voidstrike more, but I probably perfer Kinetic Barrage. 

Make sure to line up your shots when you're shooting Void balls as it pierces through normal baddies.

Also one note, Curios can vary with personal preference, but toughness and combat ability regen are very useful. The damage resistances are up to you. I also prefer maxing my toughness, but some people like more health, up to you.