Hormisdas' Hammer
 Zealot Build - Warhammer 40k: Darktide 

Vicious Offering and Unfaltering are your bread and butter. Mixed horde or just poxers/groaners - doesn't matter. Charge your heavy swings and watch the enemies ragdoll all around the place. Can't forget Second Wind for that extra touch of survivability and toughness regeneration.

Holy Revenant is your ticket out of a tricky situation. Once you reach 0 HP and Until Death kicks in deal as much damage to surrounding enemies as you can to restore up to 25% of your total HP.

Desperation plays an important role when clearing hordes. A push followed by a swing not only interrupts the horde from attacking you, but by depleting stamina gives you a damage boost. Punish Impiety also increases your attack speed, so make sure you use those push attacks frequently between heavy swings.

Backstabber , Time to Kill and Melee Damage Boost nodes along with 4-5 stacks of Martyrdom transform you into One-Punch Man of the 41st millenium the moment you enable Shroudfield . No monstrosity stands a chance against you! (except for the Karnak Twins who cannot be one-shot)

Blades of Faith are your ultimate tool for dispatching Pox Hounds, Snipers, Trappers, Bombers and Bursters.

Plague Ogryns, Chaos Spawns and Beasts of Nurgle become nothing more than a small bump on the road for the team, when you're around. 
Daemonhosts can be safely one-shot in their sleeping stage, but once awoken they will see you even through stealth and you won't be able to land a backstab when it aggros, so might require an extra smack or two. Become the valiant saviour of your teammates who suffer from insuficient situational awareness or overconfidence.
A Scab Captain or Cult Champion can also be one-shot as soon as their Refractor Shield is broken. Just make sure to land that backstab before the team deals enough damage for the shield to turn back on.

Your ranged weapon can be whatever it is you fancy. A Bolt Pistol to get rid of a pesky gunner that is way over there? A Recon Lasgun to mow down Scab/Dreg Stalkers? Or perhaps a Boltgun to delete a group of Crushers? You decide!

With this build you will have 252 HP spread across 6 wounds. Stay at or below 42 HP to have 5 stacks of Martyrdom. Stay at or below 84 HP to have 4 stacks of Martyrdom.

Try to always have a Med Stim on you to avoid situations where your HP is in the single digits. A Med Stim will heal you for 63 HP. 

Have fun and praise the Emperor!