Banned because the Undying is the regent to the most powerful being in the whole of reality, Celestial Realm and Shadow Realm alike, bound to an irremovable iron glove attached to the Centatronian throne by an unbreakable chain, destined to serve for 9 years 9 months and 9 days (now 2 days in) before being freed, and the Undying says so.
The Undying.
