Brightbloat

A mote of unruly, festering light is produced between two fingers, and surges to bury itself into a target within range. Make a ranged spell attack against the target. On a hit, the target takes 3d10 radiant damage.

If a creature damaged by this spell drops to 0 hp before the spell ends, their body explodes into a burst of flesh and light, each creature within 15 feet of its body must succeed on a Constitution saving throw or take 1d10 radiant damage, taking no damage on a successful saving throw. Damage dealt by a failed saving throw counts as damaged dealt by this spell for the purposes of triggering this effect.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the duration of this spell increases by 1 round, and any radiant damage dealt by this spell increases by 1d10 for each slot level above 2nd.