Ultraviolet Pulse

You hurl a ball of glowing violet energy towards one creature within range, which bursts into a pulse of invisible radiation on impact. On a hit with a ranged spell attack, it takes 5d6 radiant damage and must make a Constitution save or be poisoned for 1 minute. The target can repeat this save at the end of each of its turns, ending the effect on a success. 

At higher levels. When you cast this spell using a spell slot of 3rd or higher, the damage increases by 1d6 for each spell level.