Valshea's Wave of Decay

Sweeping your blade in front of you, you unleash a dreadful wave of necrotic energy. Each creature within a 20ft cone in front of you must make a Constitution saving throw. A target takes 4d4 necrotic damage and is poisoned for one minute on a failed save, or takes half as much damage and is not poisoned on a successful one.

The poisoned condition caused by this spell lasts for one minute and a target suffering from this condition caused by this spell can not regain hit points. At the end of each of its turns, the target can repeat the Constitution saving throw. On a success, the condition ends on the target.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 2d4 for every level above 3rd.