The Emperor's Shadow are ghosts usable by Arcturus Mengsk in Co-op Missions. They are elite spellcasters, which can use Pyrokinetic Immolation to deal heavy damage to enemies, and later to groups of enemies. They gain a temporary cloak at Rank 1 which prevents them from being attacked for 10 seconds. Their EMP Blast ability can stun and drain the energy and shields of targets in an area, and at Rank 3 can be upgraded to deal damage to those they effect.
Emperor's Shadows can also calldown tactical missiles, which do high damage in a small area. These can be upgraded to have no cast time.
Killing enemy units grants experience to nearby Royal Guards. If there are no nearby Royal Guards when an enemy is killed, the experience is instead split between all Royal Guards in the mission. Experience allows the unit to gain Rank, which improves its damage, armor, health, energy and unlock new abilities or passive bonuses.
Rank 1: Gain Labyrinth Cloak ability.
Rank 2: Increase Pyrokinetic Immolation periodic damage by 50%. Increase EMP Blast stun duration by 1 second.
Rank 3: Upon target's death, Pyrokinetic Immolation deals 50 damage to nearby enemies. EMP Blast drain all of the target's energy and deals damage equal to that amount.
Deals 100 damage to shields and depletes the energy of enemy units in the target area. Stuns Mechanical units for 2 seconds (+1 second at Rank 2). Cloaked units are revealed for 10 seconds after being hit.
At Rank 3, this ability deals damage to equal in the amount of energy drained.