Aether Spear

A line of pure magical force strikes out in a 50-foot-long, 5-foot-wide line in a direction you choose. Each creature in the line must make a Dexterity saving throw, gaining the stunned condition for 1 round and taking 4d8 Force damage on a failed save or half as much damage only on a successful one.

Using a Higher-Level Spell Slot. The damage increases by 2d8 for each spell slot level above 2.