Mind Control may be used to instantly deprive the enemy of an expensive unit. It may also be used to enhance the flexibility of the protoss army. Zealots benefit from medics as much as marines. Enemy workers may also be stolen, opening up the terran and zerg tech trees; each tree uses its own pool of supply and control respectively. It is typically infeasible to fully exploit another tree in multiplayer due to the time and resources required.
The dark archon may deprive enemy spellcasters of energy and life with Feedback. The ability can instantly kill a high templar, ghost, medic, Wraith, science vessel, defiler or a queen that was at full health. The amount of damage is not affected by armor or unit size.
Zerg are vulnerable to Maelstrom, which disables groups of biological units for a short time. For protoss players, Maelstrom has a lot of potential benefits when fighting the zerg. From preventing precious high templar from being sniped by mutalisks, to saving a group of dragoons surrounded by large group of zerglings with the Adrenaline Glands upgrade, Maelstrom can be used in many ingenious ways. A large group of mutalisks, held at one place by Maelstrom, can be slaughtered by corsairs or Psionic Storm, or several group of zerglings and hydralisks trying to rapidly close in to kill reavers quickly, only to be held at one place by Maelstrom and sustain two or three scarab hits before getting annihilated, are only few out of many examples of Maelstrom's proper usage.
Prevents allbiological units (friendly included) within a 4 x 4 area from attacking, moving, or casting spells for short period of time. Stunned cloaked units will be revealed. Burrowed units will not be revealed or stunned.
Transfers control of any enemy unit to the casting player. Using Mind Control will drain the dark archon's shields and leave it vulnerable.
Mind controlling a transport will also transfer control of any units the transport is carrying, and mind controlling a unit that has researched upgrades or special abilities will transfer them to the dark archon's player.
The transfer is permanent and irreversible, even after the death or the transfer of control of the dark archon who performed it. Any unit can be subject to multiple Mind Control spells, effectively changing ownership every time.