Azareck's Nightmare of the Godhead

The caster touches a creature and traps their mind within an illusion which depicts the visage of the Godhead. The caster is aware of what illusion the target is seeing. The target creature must make an Intelligence saving throw. On a failed save the creature takes 15d12 + 30 Psychic Damage and is stunned until the end of its next turn. On a successful save the creature takes half as much damage and is not stunned.

A creature stunned by this spell must make another Intelligence saving throw at the beginning of its subsequent turn. If it fails this second saving throw it goes into a catatonic state and is unconscious until the effect is dispelled, as it's mind is permanently trapped in their own nightmares. The spell ignores immunity to the unconscious condition. On a successful save the spell ends and the creature may take their turn as normal.

The effects of this spell can only be removed by the effects of wish.