Call Thunder

You charge a pulse of thunder and send it toward a creature of your choice within range. Make a ranged spell attack against the target. On a hit, the target takes 4d4 thunder damage, and until the end of your next turn the target gains vulnerability to lightning damage, thanks to the crackling sparks dancing across the target until then.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d4 for each slot level above 1st.