Sylvayne's Shattering Heart

You harness the water in the air into a cold fury creating a swirling cloud of ice shards around you in a radius of 20ft.  When cast, enemies in the radius must make a dexterity saving throw taking 3d10 cold damage and falling prone on a failed save, and half as much damage on a successful one.  The ice shards freeze in mid air while you are concentrating on the spell leaving the affected area covered in ice.  Whenever a creature enters into the affected area for the first time or starts its turn there is must make a dexterity saving throw.  On a failed save, it falls prone.

When your concentration breaks on the spell, the razor sharp shards fall to the ground.  Any creatures in the target area must make a dexterity saving throw taking an additional 1d8 piercing damage on a successful save and half as much on a successful one.

At Higher Levels: The damage of the initial shard blast increases by 1d10 and the shard damage increases by 1d8.