Festering Blast

A 60-foot-long, 10-foot-wide Line of miasma blasts from you in a direction you choose. Each creature in the Line must make a Constitution saving throw. On a failed save, a target takes 4d10 Necrotic damage and has the Poisoned condition for the duration. A creature Poisoned by this spell takes 2d10 Poison damage at the start of each of its turns. At the end of each of its turns, a Poisoned target repeats the save, ending the spell on itself on a success.

Using a Higher-Level Spell Slot: The initial damage increases by 1d10 for each spell slot level above 4.