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.
Increases the movement speed of roaches by 33%
Mastery: -2.2 per Structure Morph and Evolution Rate mastery point. Down to a minimum 44