The roach warren is a zerg structure in StarCraft II. It allows roaches and ravagers to be spawned. It is designed to simulate the humid, mountainous depths needed to create roaches.[1]
Roach warrens are available as a structure for Abathur in Co-op Missions. They do not cost vespene gas, and function as the first tech structure Abathur can construct. Upgrades for the roach and ravager can be researched here. Additional upgrades are unlocked at level 4.