Wither

You speak the words "Kal Vas An Flam".  A pulse of energy bursts out from you in every direction, and frost begins to form on the ground around you.

Any creature attempting to move while inside the Aura must make a Dexterity saving throw.  On a failed save, the creature is knocked prone.

All creatures within 10 feet must make a Constitution saving throw or take 2d10 Cold Damage

Any creature starting there turn in the Aura must make the saving throw.

Any creature entering the Aura must make the saving throw.