Nullify

Use this card to cancel a psychic power that your opponent is attempting to use or to cancel an existing power. Roll D6; on a 4+, the Nullify succeeds and the power is either cancelled or removed from play, respectively. If used
against an existing power, you may make only one Nullify per turn; otherwise, the first Nullify attempt against a particular power is assumed to be made by the psyker you control with the highest Mastery Level. If this fails, the next attempt is made by your next highest level ps