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.
The leveling up mechanics works as follows:
When an enemy unit is killed, 100 experience per supply cost of unit killed is "dropped".
If the unit is a non-Heroic unit with 0 supply cost, it will drop no experience.
If the unit is a Heroic unit with 0 supply cost, it will drop 800 experience.
Dropped experience is equally split among all eligible units (Royal Guard, not at max rank) within 15 range of the unit killed.
If there are no eligible units within 15 range of the unit killed, all eligible units on the map get an equal split of the dropped experience.
Once a Royal Guard unit has reached maximum rank, it is removed from the pool of eligible units so as to not waste experience.
Mastery: Increases the gained experience per supply by +0.5 (+4 on Heroic unit with 0 supply cost) per Royal Guard Experience Gain Rate mastery point. Up to a maximum 115 experience per supply (920 experience on Heroic unit with 0 supply cost).
Royal Guards increase Imperial Support based on their supply cost and Rank. Each point of Imperial Support generates 1 Imperial Mandate every 240 seconds.
Imperial Support=50% for Royal Guard's Supply. Depending on the Rank level, the number of Imperial Support increases by x2 (Rank 1), x3 (Rank 2) or x4 (Rank 3). Mastery: +1% of Imperial Support per Royal Guard Support mastery point. Up to a maximum +30%.
Reach Mengsk Level 5.
2 (+0.02 per mastery point. Up to a maximum 2.6) every 240 seconds
4 (+0.04 per mastery point. Up to a maximum 5.2) every 240 seconds
6 (+0.06 per mastery point. Up to a maximum 7.8) every 240 seconds
8 (+0.08 per mastery point. Up to a maximum 10.4) every 240 seconds