Price's 'Thirsty Stalwart Eviscerator' Invis
 Zealot Build - Warhammer 40k: Darktide 

My first attempt at creating an 'invis spam' build, before I realized the whole 'infinite crit' knife technique. I still keep it around though as it's still amusing and pretty fun. Run around spamming 'reved up' swings into the wave to keep procing bloodthirsty and keep getting crits, thus keeping Invis continually off cooldown and allowing for further Evis damage as one can backstab rev for quite a bit. 

I omit scourge due to bloodthirsty, I'd likely use a different keystone to but you can't get IoD otherwise, and it's the entire point of the build. As such, I use a Flammer with Everlasting Flame, so that Blaze Away can be kept up for longer and therefor the fire damage can be kept high for longer as well. You can also reload in the safety of invis and use a knife to cancel it's long pull out animation, so it helps 'keep the synergies intact'.