Plasma surge

Plasma surge is a psionic power demonstrated by protoss high templars. It involves channeling psionic energy into the plasma shields of protoss warriors, regenerating their shields. High Templar Karass demonstrated this ability, and could regenerate the shields of protoss around him. During the End War, high templar honed their abilities to aid in their race's darkest hour, learning to channel the power of their psionic storms into the shields of their allies.

Co-op Missions
Plasma surge is available as an upgrade for the high templars of Artanis in Co-op Missions, and is unlocked at level 6.

Heroes of the Storm
A variation of plasma surge called plasma shield is available as an ability for Tassadar in Heroes of the Storm.