Disrupt Derek
 Psyker Build - Warhammer 40k: Darktide 

Slight deviation from meta greatsword gaze psyker.

Graia Mk VII Vigilant Autogun is remarkably effective for clearing priority targets that need to die more quickly than assails can reach them - specialists, gunners, reapers, and shooters - and for picking up DD headshots. Against non-carapace targets it'll have essentially the same TTK as bolt or stub pistol, with less frequent reloads. With Gaze active Vigilant can quickly kill maulers and plasma gunners with bodyshots, although not particularly efficiently. Greatsword is your regular anti-armor and anti-boss. Use Assail for packs of shotgunners, dreg ragers, shooter packs, or thinning out hordes and building peril for damage output / TDR.

Can swap the health curio out for a third toughness curio to take full advantage of TDR from One with the Warp and toughness regen boosted by Warp Ghost , Warp Expenditure, etc.

Seer's Presence instead of Prescience helps with reliably chaining Gaze activation provided you've killed a chunk of elites (which is virtually always on auric+) but both are solid

Covenant Mk VI Blaze Force Greatsword Crowd Control rotation is light light light heavy -> repeat (look for diagonal upward swing to determine which light precedes heavy). The Single target rotation is just heavies.

Covenant Mk VIII Blaze Force Greatsword is good and has more horizontal CC for procing Crack of Bone, but Mk VI gets into anti-armor / boss rotation faster.

Key talents

• By Crack of Bone quells and reduces peril gain - crucial for gaze uptime. Synergizes with Warp Expenditure Warp Splitting and Lightning Speed  are enhancements.
• Precognition  - ideal synergy with disrupt destiny and By Crack of Bone
• Malefic Momentum - extremely high uptime damage bonus, just remember to sprinkle some assails in while you're slicing hordes.
• Quietude - has excellent synergy with gaze's peril gen and rapid quelling
• Empathic Evasion - mitigates mediocre movement attributes of greatsword and vigilant. Note that assails can crit and proc the talent!
• All the usual crit enhancing nodes at the top of the tree
• Vulnerable Minds - ogre and monstrosity killing good

Potential Node Swaps:

• Ethereal Shards is probably suboptimal but it's fun, kills shotgun and rager hordes harder. Can swap for something like Immaterial Focus or Just a Dream 
• Swapping Ethereal Shards  and Warp Splitting for Solidity if you have issues keeping gaze up