Aphomun's Ice Blast

A shard of ice launches forward in straight line.  When it reaches a target it bursts outward into a 30 foot cone.  Each creature in this cone must make a Dexterity saving throw. A target takes 8d6 cold damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.