the epiphany of secrets

 You enter the mind of one creature you can see within range and implant a false secret about their existence that they have just now realized.  This secret momentarily shakes them to the core and makes them question their grip on reality.  The target must succeed on a Wisdom saving throw or be incapacitated. At the end of each of its turns, it takes 1d12 psychic damage, and it can then make another Wisdom saving throw. On a success, the spell ends on the target.