Casting Time: 1 action
Range: 300 feet
Components: V, S, M (a crystalline eye worth at least 250 gp)
Duration: 2 rounds
A glowing sensor appears overhead that traces a line of frost that is 60 feet long and 10 feet wide. Each creature within the area must make a Constitution saving throw. A creature takes 4d10 cold damage on a failed save, and half as much damage on a successful one.
At the start of your next turn, you can have the sensor trace another line, after which it splinters into thousands of shards of ice striking the traced path. Each creature within the area must make a Dexterity saving throw. A creature takes 4d6 slashing damage and 2d6 cold damage on a failed save, or only the cold damage on a successful one.