Smyker Skitarius
 Skitarii Build - Warhammer 40k: Darktide 

Important: To nulify corruption gain, it is advised to have a zealot with purifying aura or hive scum with med-crate. The 90% Corruption Resistance allows you to take overheads without straight dying (you only go down), decently nulify bursters(because they are still bugged and ignore pushes), twins mines and nulify the blight mutator(as long as there is a zealot or hive scum with you). The extra wound is just in case, you can change it for more toughness.

If you don't want "True grit at home", because you are too good at this game, you can change Ablative Wards for Weakness Analysis Doctrine, Slaughter Protocol or whichever you see fit.

Electrocuting allows you to stun crushers non-stop thanks to Electro-Strike Conduit (welcome back arbi maul exploit).

Your role is aggresive. When many gunners/reapers wait until you have 2 charges and then use your ult to nulify the gunners so the team can move forward(right now is bugged, sometimes works, most time doesn't). When in horde, during a wave of maulers/ragers/crushers/specialists, you can use 1 charge as a semi-taunt to stagger enemies, gain time, and do damage. You could also wait until 2 charges(which you will get fast) so you get an additional 15% attack speed for 15s when using the ult.The more you hit and dodge, the more crit you will have and more charges you will have, thus leading to a good amount of spamming. 

When overwhelmed, or lacking toughness you can use the ult to regenerate about half.

Medicae Servo-Skull should be saved for situations in which helping/rescuing may be risky or in a multiples bosses situation where saving becomes even harder.

I suggest to alternate weapon modes for armour waves and bosses.

I use the shredder as an easy way to gain toughness in hard situations and to kill ragers/trappers/specialists. You can change the ranged weapon for any of your liking(in fact, you should do it). This is a highly melee-focused build, so the ranged can have many variations.