Blood for the blood God
 Psyker Build - Warhammer 40k: Darktide 

You will be keeping peril up by using your Warpshock Slash. Make sure that your warp resistance is as low as possible so each warpshock increases your peril markedly. At 60 peril resistance you should see your peril jump by around 40 each time you use it. Warpshock Slash is mainly used to keep up stacks but is great in softening up a cluster of adds, great at staggering Ragers, and useful for interrupting gunners as you close the distance. Just don't use it at 100% Peril ;). When you keep your peril as high as possible you gain maximum benefit from this build: Warp Rider (20% more damage), One with the Warp (33% increase to defense), Warp Splitting (100% cleave), Unstable power (20% strength),  and are immune to stuns via Immaterial Focus.

Keep stacks of Disrupt Destiny up and try your best to kill every highlighted enemy in your way. Keeping Disrupt Destiny stacks above 23 most of the time is viable, that will give you : 23% dam, 46% crit damage, 57% weak spot dam. After each Disrupt destiny kill you will also gain 25% toughness over 2.5s and 20% movement speed for 2.5s.

Your shield should be deployed tactically : Block  gunners, block bombers bombs, to revive team mates, placed over other AOEs to compound benefits, etc..

Stats while in the thick of battle:

36% crit 

20%-40% increased movement speed

53% constant Toughness damage reduction.

100% cleave at max peril

50-60% increased melee damage

15%-35% toughness per sec

20% Strength

In essence you are going to feel powerful and its easy to want to run ahead of your team to keep your stacks and momentum up. Try to hang back with your team and focus on elites and large groups of adds.