Nightmare Ultima

Nightmare Ultima is a caster-type curse used by Ankth. It causes the opponent(s) to be captured inside a black, void like sphere that holds an abandoned replica of the Fairy Tail world that is the exact same size of the Fairy Tail world, meaning the opponent(s) can not just walk out of it. In this realm, the users worst nightmare lies. In order to escape the world, the user must defeat and kill their nightmare. The longer the opponent(s) is afraid, the more powerful the nightmare becomes.