Maddening void

You rip a portal letting the space beyond reality pour in, forming a 20-foot-radius sphere of dark void that distorting space and invades the mind of those unfortunate enough to be within its reach with whispers and visions of horrors and secrets incomprehensible to mortals.

Creatures Starting their turn in the Area or entering it takes 3d6 psychic damage and must make a WIS saving throw. On a failed save become frightened for one round.

No light, magical or otherwise, can illuminate the area, and creatures fully within the area are blinded.