Castle Nadiria

Castle Nadiria is the final dungeon in Dragon Quest IV.

It appears as a shadowy castle in the centre of Hell, inaccessible to all non-monsters due to a magical barrier that has been erected around it. The party must defeat Psaro's four closest henchmen (Rashaverak, Barbatos, Pruslas, and Aamon), who are maintaining the shield, before they can enter.

Pizarro does not actually live in the castle, but on top of a mountain that can only be reached via the castle.