Psychic Beacon
Detachment ability
Genestealer Patriarchs emit a strong psychic signal, which guides the parent Hive Fleet to the planet.
When you field an army that includes detachments that have the Psychic Beacon ability:
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You can deploy any Mycetic Swarms that you have in the first turn, rather than roll for their arrival as Reserves.
[TODO: Is this the right interpretation? Seems like it might be overpowered — include a single small Genestealer Cult detachment, and all Mycetic Swarms in a Tyranid army get to deploy on turn 1, no roll for Reserves required…]