Jim's SGaze Melee Blender
 Psyker Build - Warhammer 40k: Darktide 

The strongest build I have currently come up with. Playing Heresy for fun and Damnation for more challenge.

It has undergone some tweaks and likely will have more tweaks after I share this.

This build is powered up through three things:

1) Maintaining +80% Peril; gives extra damage(+20% Warp Rider), strength(+5% on Force GS), cleave (+100% Warp Splitting), crit chance (+20% Warp Nexus blessing), and toughness damage reduction(+33% One With the Warp).

 notes: Alt Melee- Force Sword IV Deimos - Unstable Power (+20% strength with high peril) + Uncanny Strike (+24% Rending on Weakspot hit x5)

2) Using Scrier's Gaze and staying in it for 30s (or less); When fully powered gives +40% damage, +30% finesse, +20% Critical Chance, +10% Weakspot Damage, +20% Toughness Damage Reduction, Suppression Immunity and  replenish 2.5% Toughness each second.

 notes: 1. with Precognition, melee weakspot kills count as 1s in SG

              2. prolong SG by quelling peril manually or slow it by getting kills

3) Killing Marked Enemies (Disrupt Destiny); Having 25 stacks of this perk gives +25% Damage, +50% Critical Damage and +62.5% Weakspot Damage. ALSO when a marked enemy is killed regain 25% toughness and +20% movement speed over 2.5 seconds.

notes: when cleaving through hordes I find it very easy to consistently kill the marked enemy at the front of the pack which then instantly transfers the mark to the next enemy in line. This works 99% of the time.

So what do you have to do exactly? Activate SG and kill or quell until you've reached 30s, during this time also kill marked enemies as they pop up. SG will reach 100% and end, but the damage boost lasts for 10s and you cannot overheat during this time.

The perk Warp Ghost helps maintain high peril after SG ends and after SGs lingering effects end it will be ready to go again.

The Flame Staff cleaves all enemies and does high damage and can stagger, suppress and cause brittleness to armor.

The Force Greatsword Mk 6 has amazing range,  cleave, horde clear, and high damage heavy attacks for elites and bosses. Also the warp slash special is very fun and effective, make sure to use it on large groups after it has powered up to two bars.

And finally I use Kinetic Flayer with the Brain Burst which procs automatically on hit every 12s on the enemies that need it the most. (this does extreme amounts of damage)

Main drawback is lack of very high range attack. Highest range option is to switch to Brain Burst and target the sniper or far gunner that's causing trouble.