Dromug's Impaling Light

You create a spear forged from light, within range to send it in a 10 ft. line. Each creature in a 10 ft. long 5 ft. wide line must make a Dexterity saving throw. The first failing target takes 3d12 Radiant damage, they don't take damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 3th level or higher, the damage increases by 1d12 for each slot level above 2rd, and the length of the line increased by 5 ft.