Flexible Fire - Brittle Flames
 Psyker Build - Warhammer 40k: Darktide 

The Unlocked and Loaded update brings new blessings and new ways to light heretics on fire - Penetrating Flame acts as an additional brittleness debuff separate from traditional brittleness and thus can amp up the team good while you blast anything that moves.  Deimos Force Sword handles great single target on hard targets like Crushers, Ragers, and Maulers.  Anything at range that you can't light on fire, burst the brain - can daisy chain through a 12 pack of shotgunners or ragers with back-to-back Empowered Psionics Brain Bursts.  Blaze Away is the offense oriented blessing - Focused Channeling would be the defensive play for better mobility at the cost of DPS. You'll want a Burn rating on the staff of 77% or better so you can get the 15 soulblaze stacks - don't worry too much about a Blazing Spirit melee since that goes to only 12 stacks.  Creeping Flames Venting Shriek 6 stacks is enough to zap poxwalkers in a big arc so pop it as close to 100% as you can for the biggest yell.  Critical chance is good on the staff since you get more burn stacks from it.  Showstopper's funny and not too reliable compared to Blaze Away strength.  Flex points on the tree include middle right side soulblaze toughness and crit on kill - these can be routed into more toughness at the top of the tree or extra peril gen reduction on bottom left.