Prescience

By focusing his warp-sight the psyker can guide the
aim of his allies, bringing a swift and merciless death to
their foes.
Prescience has a warp charge value of 7. If manifested, select a HERETIC ASTARTES unit within 18" of the psyker. You can add 1 to all hit
rolls made for that unit until the start of your
next Psychic phase.