Hive Tyrant

All enemy units and models with the Psyker, Psychic Pilot or Brotherhood of Psykers
special rules suffer a -3 penalty to their Leadership whilst they are within 12" of one or
more models with the Shadow in the Warp special rule.

Models with the Synapse Creature special rule have a synapse range of 12". Friendly
Codex: Tyranids models within this synapse range, including the Synapse Creatures
themselves, have the Fearless special rule. If a unit from Codex: Tyranids is falling back
and at least one of the unit's models is within a friendly Synapse Creature's synapse range
before the unit moves, the unit automatically Regroups.