The Undertakers are devils, the rulers and emissaries of deep realm. They originate from plane of Nether and had come to inhabit the underworld of Gaia about the time the mortal races came to existence. They offer mortals the promises of power, in the form of wielding the Nether. The motives are unclear as to what the devils want with this world, one thing is clear they will not leave until they have met their goal. It is not unheard of to a devil walk the streets unmolested in the mortal civilization. Some societies even openly welcome them too stay in hopes of gaining the secrets of Nether.