Game Usage
 Zerg vs Terran
Both Dark Swarm and Plague are incredibly powerful against Terran. Dark Swarm safely protects all burrowed units from anything but Firebats, making Lurkers very dangerous. Plague reduces all Terran (except Battlecruisers) units to one-hit kill targets.
 Zerg vs Protoss
Although Dark Templar, Zealots, Reavers and Psionic Storms can hit under Dark Swarms, it is very useful against Dragoon-heavy armies. Dark Swarm with Zerglings can also take out Protoss bases when they are only defended by Photon Cannons.