Dominion

The Tyranid uses its prodigious psychic strength to
channel and amplify the will of the Hive Mind.
Dominion has a warp charge value of 5. If
manifested, select a friendly TYRANIDS unit
within 36" of the psyker that has the Instinctive
Behaviour ability. Until the end of your next
Psychic phase, that unit ignores its Instinctive
Behaviour ability and automatically passes
Morale tests.