Nullify
Cancels a psychic power anywhere on the table, whether it is being cast or already in play. Roll a dice: 1 to 3 and the attempt fails, 4 to 6 and it succeeds. Subtract 1 if the enemy Psyker is of higher Mastery Level, add 1 if they are lower, and subtract 2 if the army contains no Psykers at all. It has no power over another warp card.