Zuggtmoy resembles a human only from the torso up. This portion of her body is composed of thick rancid sheets and coils of fungus that just happens to have grown into the shape of what would otherwise be an attractive woman. Four fibrous antlers grow from her broiv. and her hands bear cruel talons. Her lower torso is a coiling pillar of lashing ropy tentacles and other fungus growths. Her skin is a nauseating swirl of grays, blues, purples, and blacks.
Zuggtmoy has long struggled with maintaining viable cults on the Material Plane; as it turns out, most humanoids have little interest in worshiping fungi. To combat this, she often establishes cover cults that are subservient to her actual worshippers. Zuggtmoy often finds herself at odds with other demon lords who share similar inrerests in the Material Plane. For some time, Lolth was her greatest competition for dominance of the Underdark, but the Spider Queen's ascension as a deity has effectively elevated her out of contention. Cultists of the two still clash now and then, but these are minor skirmishes rarher than a war.
Of more immediate concern to Zuggtmoy is Juiblex, who shares her realm. The two demon lords have long warred for dominance over Shedaklah, wirh Zuggtmoy rradirionally holding control over its surface and Juiblex being forced ro lurk in the deepest caverns below. With Zuggtmoy's recent period of imprisonment on the Material Plane, Juiblex was able to greatly expand his hold on Shedaklah.