ZeTank
 Zealot Build - Warhammer 40k: Darktide 

57% Toughness damage reduction with base TDR, and Enduring faith, up to 70% TDR with 6 stacks of Martyrdom and 88% TDR with Shield of contempt on top of all that.

Tac Axe II or VII - The highest crit rate you can get in a melee weapon. Heavies for hordes, and lights for dps and smaller groups, or just stacking buffs.
Perks

• Flak - Crit Chance or Maniac are all good options, flak is a common armor type that can't be one shot.
• Carapace - You will want more heavy armor damage, can be replaced with Crit Chance or Maniac.

Blessings:

• Shred - The reason we are here, higher crit chance to make sure we are alway getting our TDR.
• Decimator - highest damage option. Headtaker is more consistent, and All Or Nothing works well with Desperation. Brutal momentum (particularly on the Tac II is great for horde clear)

Heavy Laspistol - another very high crit rate weapon. Headtaker Autoguns can also be used well here to proc Enduring Faith at range.

Perks:

• Unyielding - Primary purpose here is to proc Enduring Faith, and kill bosses.
• Crit Chance - Can be replaced by Maniac, but not necessary with Knives.

Blessings:

• DumDum - Great damage blessing, gets renewed from DoTs
• Infernus - a large component to our boss killing power.

The only TDR talent we are not running, Good Balance, is just too situational and doesn't last long enough to be reliable.
 

Can run Duellist and Desperation if you are wanting to go a little more squish and a lot more damage - more viable if/when Duellist is fixed

We have to give up Sustained Assault to get Invocation of death, but it will give us way more ult than any other CD ability. 

Pious Cut-Throat  Back stabs are not too difficult to get specially after using ult or push attacks and lets us keep Sustained assault - it is a very viable alternative.

Martyr's  purpose is a terrible option for CD reduction as it is only health damage, which simply will not happen often after you get to your desired health