Havoc Inferno Build
 Psyker Build - Warhammer 40k: Darktide 

This is probably the best set up for any level havoc or Auric+. This build covers the most weaknesses while sacrificing some damage output. If you have a decent team and are using Telekine Dome you can opt to remove Sanctuary and spend that point elsewhere. 

If you are playing pubs you can switch Venting Shriek for Telekine Dome. Most of my losses in pubs are from dumb moves by teammates and this helps reduce the chances of that. 

If Rotten Armour is a modifier I tend to swap Warp Nexus to Penetrating Flame for better team support but that will also reduce your crits and therefore your survivability and damage elsewhere. You'll also want carapace and flak perks on your sword. Outside rotten armour I swap flak to maniac. 

As usual, you get over headed by a crusher or mauler and you dead. Like, dead dead. 

Curios

Toughness and combat ability regen are most important. Everything else is preference.

Talents

Just a Dream is an awesome skill but you want to be careful when running the shield because it can get away from you in heavy fire and raise your peril way faster than expected leading to blowing up. You can switch this for Immaterial Focus if you find yourself blowing up from sudden peril jumps.

Penetration of the Soul looks decent on paper but is mostly useless when you see the math. It's only helpful against crushers which you shouldn't be engaging with fire anyway. 

Kinetic Flayer is a regularly debated perk choice but I swear by it. The difference in my elite/special kills and overall damage output with and without it is significant. I always keep it when using inferno staff. 

In general, toughness and damage reduction choices are up to preference but I generally take at least two.