Uaithne's Ephemeral Requiem

You unleash a powerful necromantic requiem inspired by Uaithne's mournful melodies. Choose a point within range. All creatures in a 40-foot-radius sphere centered on that point must make a Constitution saving throw. On a failed save, they take 10d8 necrotic damage and are stunned for 1 minute. On a successful save, they take half damage and aren't stunned. At the end of each of their turns, affected creatures can repeat the saving throw to end the stunned condition.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 5th.