A fungus that grows in layers upon layers, like a sea of clouds, which mostly grows on trees deep in the rainforest and is considered by the people of Sumeru to be a symbol of the gods' grace.
Legend has it that in ancient times, there was once a towering giant tree with its crown covering the entire Sumeru. People addressed it as Rukkhadevata and believed the Fungi scattered throughout the rainforest were the holy crystallization of its legacy. In Sumeru, those who dwell in the forest have a tradition of offering Rukkhashava Mushrooms to the Akademiya, but no one knows what these offerings are meant to be used for.