EMP Shockwave is a spell cast by the Science Vessel. It disables all Shields and energy of any unit or building in a 3x3 matrix radius.
 Game Usage
 Terran vs Protoss
EMP is an effective counter to Arbiters. Arbiter-heavy Protoss armies rely on Stasis Field and Recalls, EMPs can prevent both from being cast.
 Terran vs Zerg
Irradiate is more effective at fighting off Defilers and costs only half the amount of energy as EMP. Defilers can also use Consume to regain their energy quickly.
 Terran vs Terran
EMP is used to strip Battlecruisers of their Yamato Gun energy.