Thunder Spear

You hurl a Blt of Lightning at a creature or an object within range. Make a ranged spell attack against the target. On a hit, the target takes 1d10 Lightning damage and 3 Thunder damage in a 5 foot radius of anywhere that was hit.

Cantrip Upgrade. The damage increases by 1d10 when you reach levels 5 (2d10 +4T), 11 (3d10+5T), and 17 (4d10+6T).