Brood Nests

Brood Nests provide Tyranid invasion forces with instant reinforcements. Hidden safely underground, Tyranid creatures are nurtured inside the brood nests. On the surface a brood nest only appears to be a series of entrance holes but underneath will be a complex of womb-like caverns, inside which bio-killers grow. Once fully grown they remain in a state of hibernation until the Hive Mind requires them, at which time they are awakened and claw their way to the surface, exploding from the brood nest entrance still covered in amniotic slime and mucus, fully grown and ready to kill.