Call the brood

Bounding from the dark corners of the battlefield come
hulking figures with razor claws and ravenous eyes.
Use this Stratagem at the end of your Movement
phase. Add a new unit of up to 5 Genestealers
to your army and set them up as reinforcements
wholly within 6" of a Broodlord or infestation
node from your army and more than 9" from
any enemy models.