Crucis Mk II Thunder Hammer & Artemia Mk III Purgation Flamer
 Zealot Build - Warhammer 40k: Darktide 

The way to use this build is simple.  Use your Crucis Mk II Thunder Hammer to take out tougher threats: Monstrosities & Elites (Crusher, Bulwark, Reaper, Scab Mauler & Mutants). For Horde-clear use the Artemia Mk III Purgation Flamer before going in with your Thunderhammer to clear up any of the remaining trash.

• The perks for your Crucis Mk II Thunder Hammer are optimized to assist killing the tougher Elites/Monstrosities (Carapace & Unyielding) however using (Maniac & Unyielding/Carapace) maybe preferable for you in order to kill Mutants easier, although with a good Thunderhammer and Thrust you shouldn't need it.  For the blessings Thrust & Slaughterer are the best however if you cannot get Slaughterer then a good alternative is Headtaker. (Headtaker stacks will proc of your Stun Grenade & Flamer ticks, making stacks easier to acquire).  If you are struggling with keeping your Toughness up, changing to a more defensive set-up with Momentum in exchange for Slaughterer & Headtaker is a option (you will get better with practice).  For the Thunderhammer you want 80% Damage, 80% First Target, 80% Penetration, 80% Crowd Control with your dump stat being Defences with stat priority in that order with Thrust being your priority blessing.

• The perks for your Artemia Mk III Purgation Flamer are optimized help take out Monstrosities & Bosses (and mixed Hordes) as the Flamer on it's own is strong enough to take out trash enemies without the need of optimized perks. By using your ability Chastise the Wicked in combination with the Flamer on Elites & Monstrosities you can melt them quickly.  For the blessings Blaze Away & Overpressure are the best (most damage output). For the Flamer you want 80% Damage, 80% Burn, 80% Cloud Radius, 80% Ammo with your dump stat being Mobility with a minimum of 51% with stat priority in that order with Blaze Away being your priority blessing.

DISCLAIMER:  This build is designed with the idea that you have god-rolled these items with TIER IV Blessings and such any information given is based on the predication you have said god-rolled items.  Naturally if you do not have god-rolled items, your performance with this set-up with vary however you should still utilise this build as a template even with sub-optimal gear.