Bug: Casting the Sorcerer's Storm Atronach ultimate will cause the casting animation and lightning bolt to occur, but the Atronach fails to spawn. This also drains the player's ultimate, effectively becoming a wasted use of an ultimate ability.
Circumstance: Most of the time the bug occurs when there are many enemies fighting a player or group all at once, and the ultimate is cast during the heat of battle. I have also noticed it occur during duels, where the Storm Atronach will fail to appear.
Since: Homestead patch
Platform: Xbox
Server: NA