Wizardry: Proving Grounds of the Mad Overlord - Complete - NESThe Mad Overlord Trebor was once only power mad, but went off the deep end after he acquired a magical amulet of immense power, only to have it stolen from him by his nemesis, the evil archmage Werdna. Werdna, not quite sure how to use the amulet properly, accidentally causes an earthquake which creates a ten level dungeon beneath Trebor's castle. To avoid looking silly, Werdna declares the dungeon to be the new lair for him and his monster hordes.