"You're not gonna believe this! Defilers are here, and they'll be able to shield other zerg around them."
Defilers appear in .
Game Unit Edit
The bones of defilers appear in
as zerg research objectives in the level Wings of Liberty The Great Train Robbery, and in the Heart of the Swarm mission Fire in the Sky as evolutionary objectives for Kerrigan. 
Nova Covert Ops Edit
Feral defilers appear in
as Nova Covert Ops feral zerg in the mission " Sudden Strike."
+1 bonus to armor per level for zerg ground units.
The untextured defiler model
, an untextured model of the defiler was included in the StarCraft II Galaxy Map Editor for . StarCraft II: Heart of the Swarm The model is identical to the model later used in  Covert Ops.