Monster King's Castle
From Dragon Quest Wiki
|Monster King's Castle|
|Game||Dragon Quest Monsters 2|
It is accessible through a teleportal in Hitano after retrieving the Heaven Sword, Heaven Helmet, and Heaven Armor. EvilArmors stand guard at the doorways. The boss is Mudou. After his defeat, Darck appears and gives Cobi or Tara the Limbo Key.