Thunder Blade

You draw a thin bolt of lightning and launch it at one creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d10 lightning damage. Hit or miss, the bolt then explodes with a loud noise. The target and each creature within 5 feet of it must succeed on a Constitution saving throw or take 2d6 thunder damage.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the thunder damage increases by 1d6 for each slot level above 1st.