Xellos is a high level Mazoku (see Universe section below), who is more than a thousand of years old. Xellos is the priest of "Greater Beast Zelas-Metallium." Great Beast is described as one of the five demon lords "given birth to" by Shabranigdo. The remaining 3 of the 5 demons lords each have priests and generals that serve them, each created by their respective masters. While most of the demon lords have at least one Priest and one General, in Xellos' case, he alone serves Zelas, making him the most powerful being in the world outside of the Mazoku and Dragon gods. Xellos served Hellmaster Phibrizzo (another of the five demons) by request of Zelas in his attempt to destroy Gaav the Demon Dragon King.
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