Arcane Blizzard

You become the embodiment of cold and darkness.  For the duration stated you create a storm of ice and snow that comes from you and expandes to a 40ft circle.  Each creature in range must make a Constitution saving throw of 16.  If they fail they become fully frozen from head to toe and remain in place for 1 turn and take 12d6 cold damage on a failed save.  On a successful save they take half cold damage and are not frozen in p[lace but their movement speed is haved.