Tzeentch's Firestorm

The psyker conjures a storm of pink and blue fire that mutates his foes, leaving capering Daemons that
claw and bite in its wake.
{7}Select an enemy unit that is within 18" of the
psyker and visible to him. Roll 9 dice; the enemy
unit you selected suffers a mortal wound for each
roll of a 6.