Mushrooms

According to legend, mushrooms were created by Murex clan in an attempt to display Malacus clan as a living thing. They started infecting people who served Malacus clan by growing out of their flesh and skin. They were intended to be a curse and a burden; Malacus clan instead turned the mushroom infection around for their own benefit. Mushrooms were used to strengthen fortresses, and in some cases were grown large enough to live in. They were also used for medical purposes and as a food source.

Despite being written up by Fluffy (OP), she has never confirmed this tale to be entirely canon. It should be treated as one might treat a legend or a folk tale, it could be true, or it may be entirely made up for the purpose of entertainment. It would be a story told by the Vixen-folk, recorded in Tales of the Phoenix.

Traditionally, higher-ups in Malacus clan will begin growing mushrooms out of their shoulders.