The defiler mound is a zerg structure which provides the genetic template for the larvae to morph into defilers. The mound itself is a pool of cancerous soup strewn with a tangled mess of twisted biological rejects. The mound is so poisonous that mineral chunks around a mound are tainted with the essence of the defiler itself.
Sprays all units and buildings in a 3 x 3 target area with spores that inflicts 25 damage per second for a maximum of 295 damage. 'Plague' will not kill or destroy affected units and buildings leaving at least 1 hit point. Plague does not drain shields but will affect the hit points underneath regardless of shield strength. Affected cloaked units will be revealed.
Kills a "friendly" zerg unit while giving the consuming defiler 50 energy points. The amount of energy gained is the same regardless of the unit 'consumed'. Therefore a cheap unit, such as a zergling, or one that is about to die, is considered the best "food".