Scourge are suicidal Zerg anti-air units that require a Spire and thus Lair-tech to build. They serve as the Zerg primary airborne anti-air with Mutalisk. A pair of Scourge is spawned from a single morph of Larva, like Zerglings. Because Scourge deal 110 damage each, it makes them very cost-effective. This is particularly the case when Scourge are used against expensive units that rely on their speed units for their survivability, like Science Vessels. Scourge are also effective in dealing damage in a short amount of time, as in the case of drop attacks, where Scourge destroy the transport unit before it can deal any significant damage.