This power may be used once per turn at the beginning of the Tyranid player's Assault phase and requires a Psychic test to use.
If the test is successful, the Tyranid player can nominate a single Tyranid unit that is within 18" of the creature using the power. Models in the affected unit will strike back in close combat even if killed before their turn to attack in the Initiative order. The dead models are removed once they have made their attacks. This power only works for the duration of a single Assault phase.