Purgery Knife
 Zealot Build - Warhammer 40k: Darktide 

General: When attacking anything with either of your knives, you should always be aiming for the weak spot. When being attacked, as applicable, farm the attacks for perfect dodges. It will provide you tons of crit bonuses and stuffs between your knife and talents.

Hordes: Left click spam largely. Use push attack fairly liberally to keep 'em in line. Alternatively, to delete them, pull out the flamer. You can cancel the flamer wind up using your talent knives.

Elite: Special action should stun them. 'sides that, heavy attacks and, if you can manage it, go for the back. Use Shroudfield for damage insurance only if you're confident Shroudfield won't have a more supportive role to play later.

Gunners: Burn them down. If they're too far, get their numbers to a respectable size with your TKnives. Get in close (shroud as applicable or slide to oblivion side to side) and then stab or burn them.

Special: Give 'em a hearty, heavy stab, or just chuck a knife at them.

Monstrosities: Shroudfield, heavy stabs, don't get killed... Dodge the Plague Ogryn and Beast of Nurgle, block the Chaos Spawn, and gtfo when you're overwhelmed (Shroudfield is good for that).

Reviving: You can use Shroudfield to get people up relatively stress free. 

Clutching: Run fo yo goddamn life. Make sure you have Shroudfield when you get to your downed teammates. If anyone can do it, you can with this build. ... Caveat: If the Chaos Spawn is on you, you're not getting away. Pray to the Emperor and use everything you have to bring it down before continuing standard clutch procedure.

Mobility Tech: Hold left click and then block before you automatically swing down so that you minimize the downtime of your knife charging. During your knife charging, you're faster.