Eldritch Cannon [Thunder]

A beam of crackling black and blue energy lances out toward a creature within range, forming a sustained arc of otherworldly energy between you and the target. Make a ranged spell attack against that creature. On a hit, the target takes 3d12 force damage and 2d8 thunder damage.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the initial damage increases by 1d12 for each slot level above 5th.