 The premise behind this is that an Abyss appears in each of the five kingdoms (Mellow Hills, Evernight Forest, Heaven's Peak, the Golden Hills and the Ruborian Desert), causing the residents to disappear.In each of the Abysses there is a hero being tortured and an Abyss Stone.In order to obtain the Abyss Stone and gain control over the Abyss, the Overlord has to battle Wraiths, the residents of the Abysses, and the fallen heroes.