Ethereum Wave-Caster

Ethereum Wave-Casters are ethereals found in the Arcatraz.

Abilities

 * Polymorph (5 sec duration)
 * Sonic Boom (Counterspell + about 1000 Arcane damage)
 * Arcane Haste (buff)(decreaes time between attacks by 50%)

Tactics
Try to keep this mob CC'd the duration of the fight and kill it last...you don't want your healers getting sheeped.

These mobs also have a self-buff that increases spell casting speed by 50%. A mage can spellsteal this to greatly increase their DPS.

Immune to Mind Control on Heroic mode.