Scourge (StarCraft)

Scourges spawn in pairs. Patrolling scourges may help deter low intensity enemy drops. Without supervision groups of scourges tend to lock onto and attack the first target that comes into range which may be overkill against low-HP targets (causing scourges to sacrifice themselves needlessly). Using other units to draw enemy fire may allow scourge to hit.

Corsairs may be micromanaged to negate attacking scourge. If the corsairs are not managed so expertly, armor upgrades may be beneficial for scourges.

If a scourge egg is hatched after the controlling player is eliminated, one will spawn normally but the other will become blue and neutral.

Development
Originally, scourges were called "avengers." Instead of being produced at a hatchery, they spawned from destroyed guardians.