Elemental Javelin

You channel elemental power into a held polearm, which is consumed by the spell. The weapon flashes with elemental energy and transforms into a beam of pure energy that streaks toward a target. Choose Cold, Fire, or Lightning for the type of spike you create, and then make a ranged spell attack against the target.

On a hit, the target takes 4d12 damage of the chosen type. Whether the attack hits or misses, a line of elemental energy 5 feet wide and 30 feet long erupts through the target's space, extending away from you and starting in the target's space. Each creature in that line, other than the original target, must make a Dexterity saving throw. A creature takes 4d8 damage of the chosen type 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 single-target damage increases by 1d12, and the damage from the line increases by 1d8 for each slot level above 3rd.