Sir Besnic Tuddle

Sir Besnic Tuddle and his forces originally banished Suchen to his prison. Since destroying Suchen's Amulet (See Monster Manual Demons' Amulet) would only banish Suchen for one year, and undoubtedly someone would summon him then, Besnic decided to imprison Suchen's being within a special prison cell who gates were locked by Besnic's Key and the Keeper gem.