Some detachments contain many individuals that have low-level psychic power that they can pool as a group. When they do this, they can manifest some useful effects on the battlefield.
Where your detachment has the Psychic Focus ability:
Once per game, you can make a special psychic attack with this detachment. This works exactly as if it were a Fate card with the title 'Psychic Attack (0) — Psychic Blast'.
When you wish to make the above attack, or to play a Psychic Attack Fate card, you may choose any unit in this detachment to channel the effects, as if that unit had the Psyker ability.