Eldritch Mist

An otherworldly fog emanates from the caster at an unnatural speed, it crackles and flashes with Eldritch power, redolent of a violent thunderstorm, as images of monstrous tentacles seem to writhe within it, and discordant voices whisper in the minds of all the creatures within its radius.

All creatures who enter the mist, or start their turn in it, must pass a Wisdom saving throw or take 1d8 psychic damage and be paralyzed. Affected creatures must succeed on a DC15 Constitution saving throw to end the paralysis. They must repeat this check to shake off the damage on their turn or leave the affected area.

Each combat round, on the caster's turn, they can roll the damage again. 

The fog can't be penetrated even by Darkvision or any source of light, except by the caster. The psychic damage does not affect the caster.

The spell is canceled upon the caster's death or at the caster's volition.