Triskaidekaphobia

You touch a target who must succeed on a Charisma saving throw or be cursed with an irrational and extremely intense fear of the number 13. For the duration, whenever an affected target rolls a 13 on a D20 test, they take 100 psychic damage. If the target rolls a 13 on their saving throw against this spell and fails the saving throw, the spell becomes permanent, being unable to be removed by any conventional form of magic, including wish. In this state the spell can only be removed if the seventh son of a seventh son of a seventh son, whose entire family must have dedicated their lives to the service of a god of luck, invokes divine intervention to undo the spell.