Noxxion is an elemental, and he doesn't fight alone for long: during the fight he summons his Noxxion's Spawns. The Spawns aren't elite. Gather them, AoE them down and get back on Noxxion.
Casters want his Noxious Shooter, a Nature wand.
TankPick up the Spawns as soon as they appear so none of them reaches your healer.
HealerThe Spawns add a burst of damage. Top the group off when they come out.
DamageSwitch to the Spawns with AoE, then back to Noxxion.
