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.
The defiler genetic code can also undergo evolution here to provide the defiler with abilities like Plague, Consume, and Metasynaptic Nodes (more energy).
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.
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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".