Psyker
12.5-20% Critical Chance for 6s on successful Dodge.
45-60% Finesse Damage for 2s on successful Dodge.
Quell 6.5-8% of your Peril on Weak Spot Hit.
-8.5--5.5% Charge Time on Chained Secondary Attack. Stacks 3 times.
This one is all about horde and elite/special control whilst staying mobile and providing cover for your team.
Use Voidstrike for basically everything to build up Empowered Psionic stacks, which you can then use to Smite whatever Elite/Special wave comes your way. Good for sniping Specials/Elites before they can come close.
Charged shots will stagger everything apart from Mutants and bosses.
Use fully charged Smite for hordes (with Empowered Psionics), melts them easily and gives you your stacks back in seconds. Works very well in a pinch, too - go smite that Mauler gang rolling towards you, give your team some time to dispatch. If that doesn't work: Duelling Sword headshots after dodging thanks to Riposte/Precognition.
Use Duelling Sword for mobility or individual Elites/Specials. VERY strong against Mutants. Excellent range, defense (thanks to Kinetic Deflection) and decent against smaller hordes.
Shields for whenever you get bogged down, a horde appears, a boss appears. Gives your team a lot of room to breathe and reload, reposition.
Soulblaze nodes optional, I like the extra burst in damage but you could spec into Solidity instead for faster quell speeds.
Auric Maelstrom approved.