Hydaelyn

You manipulate ice aether to create a massive shard of ice which falls at a location you can see within range. The shard explodes, dealing cold damage to creatures in a 30-foot radius, and the ground becomes difficult terrain for 1 minute or until melted. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d8 for each slot level above 5th.