Psyker, Selenske's melee build
 Psyker Build - Warhammer 40k: Darktide 

I don't make my own builds a lot but since mister E had no updated melee psyker build for depths of the damned (that I know of) I made my own and it's been pretty good even in havoc.

Pros:

High single target damage with heavy spam

Good cc with warp slash and lights

las pistol let's you move quickly while taking out specials like snipers, trappers, and bombers.

Cons:

A lot of the tankiness of this build relies on Just a Dream converting damage to peril which can make managing peril difficult if you are using assail and warp slices often.

One of the best single target moves is the blades push attack stab but it takes a second to get going

Even with buffs to melee psyker it's still not a class entirely made for melee so you have to have some skill in dodging and positioning to not get one tapped in a crowd.

While the las pistol (or something like the recon lasgun if you prefer) aren't bad at taking out ranged units this build can struggle with walls of gunners on the other side of the room but that's why having a ranged weapon with high movement speed is important.

Notes: 

you can use any of the psyker's auras I just felt that the extra bit of crit helps proc empathic evasion.

the gun doesn't matter too much  as long as it's something that can take out specialists from a distance and allow you to move in fast since this build does struggle with ranged enemies the recon lasgun would work great with this build because of the crits.

I might add pictures or maybe even a video if I get any games that display how well this build can perform.