Cloaked by the Storm (2CP)

Use this Stratagem in your Psychic phase, after resolving the effects of a psychic power from the Tempestas discipline manifested by a SPACE
WOLVES PSYKER model from your army.
Until the start of your next Psychic phase, each
time a ranged attack is made against a friendly
SPACE WOLVES unit within 6" of that
PSYKER model, subtract 1 from that attack's hit
roll.