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Mi-go, commonly called the fungi from Yuggoth, are mainly fungoid in nature, but externally they have many features in common with crustaceans, such as multiple jointed limbs and a carapace. Folded against their bodies when not in use, their fan-like wings allow them to fly rapidly through space or clumsily in an atmosphere, and their heads are brain-like excrescences covered with small bristles which can change color for communication.

Mi-go develop custom spores and fruiting bodies, thus giving rise to endless varieties of their species. There are some mi-go whose hyphae grasp and feed from the very universe and the void of space itself, though most use these filaments to feed on animals and minerals. Their hyphae can sting and induce madness as they eat prey.

Most mi-go modify themselves surgically, magically, and genetically. Some are little more than gigantic brains while others are heavily-armored mi-go warriors. Adventurers typically encounter mi-go scouts, who are by no means the most advanced of their kind.

Masters of Technology. These highly intelligent creatures have advanced knowledge and skill in chemical and biological processes. Their brain cylinders and sensory machines are common examples of the many wonders they can create. As such, it is difficult to prepare for and know what to expect when encountering the mi-go. One could wield a new weapon a mi-go scientist developed to kill a specific person, which it does with unnerving efficiency. Another could spread madness-inducing spores modeled after the mi-go’s own hyphae.