Dimming Drowsiness

Dim, greenish light spreads within a 30-foot-radius sphere centered on a point you choose within range. The light spreads around corners, and it lasts until the spell ends.

When a creature moves into the spell's area for the first time on a turn or starts its turn there, that creature must succeed on a Constitution saving throw or take 1d10 necrotic damage and suffer one level of exhaustion. On a successful save, the creature does not take any damage but they still suffer exhaustion.