Thunderbolt

You summon a lightning bolt to throw at one creature within range. This is a ranged spell attack against the target, and on hit, the target takes 1d10 Thunder damage. Hit or miss, the bolt then explodes, and the target, in addition to each creature within 5 feet of it must succeed on a Dexterity saving throw or take 2d6 lightning damage and 1d4 thunder damage.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the lightning damage is increased by 1d6 for each slot level above 1st. (ex. used at level 2 slot: 1d10 Thunder damage, 3d6 lightning damage plus 1d4 thunder damage)