Defias Evoker

Defias Evoker can be found in the Deadmines usually patrolling with Defias Overseers.

Strategy
Kill Evokers first. The Frost Armor will slow your tank's attacks down as long as they're up and the Quick Flame Ward will proceed to annoy fire mages and warlocks. Flamestrike should simply be healed through.

Notable loot
They have a chance to drop Silk-threaded Trousers.