Tyranid Warrior Brood

Synapse Creatures and Tyranid units that are within 12" of a Synapse Creature are said to be within Synapse range. A unit that is within Synapse range is not subject to the Instinctive Behaviour rule and gains the Fearless rule. If a unit that is falling back is within synapse range before it moves, it automatically rallies, regardless of any normal restrictions.

Any enemy Psyker that takes a Psychic test within 12" of a Tyranid with the Shadow in the Warp special rule must take the test on 3D6 and will suffer a Perils of the Warp attack on the roll of any double 1 or double 6.