Creature of Flame

The Creature of Flame is an uberboss located in Dimensional Sanctum which can be accesed through Caldeum

The Creature of Flame is a powerfull ranged attacker, that casts non homing instantkill missiles. This attack cannot be tanked in any way (other than Avoid), but luckly for you, the Astral Guardian's attack will render you immune to the Creature of Flame's attack for a short time. Other than this attack, the Creature of Flame has a decent pool of HP, and no special immunities.