Protoss structures, like their units, cannot be repaired of damage sustained while the shields were down (exception to this is a terran medic healing a non-mechanical protoss unit).However, they are unable to heal damage sustained when their shields have been depleted. Shields on all units can be regenerated almost instantly by the protoss shield battery structure. Shields are instantly drained by the terran science vessel's EMP ability. Shields, however, always take full damage (see damage types). The only race with defense buildings that can attack both ground and air by themselvesĪll protoss military units (including buildings) have shields when damaged, shields regenerate over time, even faster than zerg units heal.Very powerful special abilities (the Psionic Storm is often referred to as the 'most powerful special ability in the game').3.2 Second Round / Post-Opening Strategies.