Feedback cannot be cast on Hallucinations (even if the unit they portray should have energy).All spells (including D-Matrix and Restoration) will dispel Hallucinations.Occasionally Shuttles or Arbiters are Hallucinated to feign a drop or a Recall (as a result, your opponent can be tricked into repositioning his army), Carriers to make your opponent think you have more of them than you do, or Zealots to clear Mine fields or draw Tank fire. The spell can be used to divert attention or to confuse your opponent. The use of Hallucination is extremely limited and used only when the benefits outweigh the cost of precious energy. A Hallucination may be instructed to attack and will appear to do so but its attacks will do no damage. Hallucinations are unable to do anything but the five basic functions (move, stop, attack, patrol, hold ground). Additionally, Hallucinations have a timed life represented by their energy bar, which depletes after 56.7 seconds. Hallucinations have no armor, and are dispelled by most spells. When attacked by normal means, the Hallucination will dissipate when its Hit Points are depleted.

A Hallucination has the same number of Hit Points and Shield as the source unit (and can even regenerate HP, be healed, recharge its Shields, use a Shield Battery or be repaired) but it takes double damage from all attacks. Using this spell does not triple the size of your army.

Hallucination hearthstone