Talia's Frozen Shards

A blanket of vicious, frozen spines erupts from the ground in a line 10 feet wide and 30 feet long.  Enemies standing within the area of effect must make a Dexterity saving throw, taking 3d6 piercing and 3d6 cold damage on a failed save, or half as much on a successful one.  On a failed saving throw, a creature's lower body is also encased in a solid layer of ice, trapping them in place.  Until the beginning of your next turn, an affected creature's movement speed is 0, and it has disadvantage on Dexterity checks and saving throws.

At Higher Levels:  When you cast this spell using a spell slot of 4th level or higher, both the piercing damage and cold damage dealt increase by 1d6 for each slot level above 3rd.