Pswordbased and agripilled
 Veteran Build - Warhammer 40k: Darktide 

WARNING: THAT IS NOT A CLUTCH BUILD - IT'S JUST A FUNNY ONE-SHOT SLUG TEST

What can it do? One-body-shot most of human-sized specialists (gunners, flamers, etc). One-body-shot Maulers. One-head-shot muties. One-head-shot maniacs. One-head-shot ogryn gunners. Just load your slug in and give em a taste of that sweet crit. 

How to play? STAY CLOSE TO YOUR TEAM. 

Shoot stuff with your regular ammo. Press "F" and mark desired enemies to instakill them in one aimed slug shot. 
They're not dead after slug hit? Yeah, just shoot em with you regular ammo to finish them while they are staggered. Just don't waste your regular ammo for Crushers, use slugs to stagger them and help your team. 

Horde comes in? Swap to your sword and take them out in a couple of swings, killing 5-6 poxwalkers in a row. 

Sniper is trying to take you down? Just load your slug shot and teach them a good lesson. 

Once again, MARK EVERYTHING with your keystone ability, since it adds just a little bit more damage to one shot stuff, that Agripinaa shotgun missed pre-patch. And aiming is a must have too, since we got that sweet Deadshot ability. 

Melee wep: 

Power Sword with brutal momentum blessing and a power cycler is a great choice to deal with hordes and some-kind-of-mixed hordes. The brutal momentum allowes you to kill lots of pox walkers just in one horizontal powered light attack sweep, with extra ability to deal some damage to any mixed in elites. But you also can go with weapon of your choice, since it's all about being comfortable for you. 

Ranged wep: 

Agripinaa Shotgun: must have for this build because of special slug ammo that can deal A TON OF DAMAGE. 

Full bore and no respite is a must have since you will always get it triggered with your special ammo = nearly constant +20% power and +20% damage on staggered enemy. Perks are up to you, you can switch something to +5% crit chance, but IMO Flak and Maniacs are the best ones. 

Try to get everything as close to 80% base stat as much as possible. You can sacrifice ammo and mobility, it's not essential. 

Curios: take whatever you like. I prefer +3 stam, +17% tough and +21% health, but you can swap stamina with extra toughness. 

Tree: 

EDITED: since hotfix 1.2.12 Exhilirating Takedown works again properly, so we're taking it. 

Changed something in a tree to gain more toughness to increase surviveability. Feel free to modify the tree as you wish, since lots of talents are worth taking: Reciprocity and Duck and Dive, Confirmed kill, Krak Grenade, Demo Team, Demolition Stockpile, Kill Zone, Catch a Breath, Tactical Reload, Counter-Fire for killing ranged trash.