The Creature Chamber is normally restricted to the creation of land-based creatures, but if the player constructs a Water Chamber, amphibious units can also be created by it. A player may build multiple Chambers to speed up production, as the building can only create one creature at a time.
The Creature Chamber can only create a creature if its appropriate research level has been unlocked. For example, research level 3 must be completed before level 3 creatures can be created. Creatures of higher research levels typically require more time to create.