Abyssal Nightmare

You conjure a 30-foot radius sphere of magical darkness, centered on a point within range. The space within mimics the pitch-black depths of an ocean, affecting the minds of all creatures within the darkness. Each creature that enters the area of this spell for the first time on their turn, or starts its turn there, must succeed on a Wisdom saving throw or begin to drown as if completely out of breath. The effects of the spell on a creature end when that creature leaves the area of effect of the spell, or when they use an action on their turn to attempt the saving throw again.

Additionally, the area within the magical darkness counts as difficult terrain