Sumendian is a gender in The Nadurian System, one of the four Nature Systems. It is a gender which is both connected to nature and its overall aesthetics but which has a specific and strong connection to volcanoes. One may feel like their gender is specifically related to volcanoes, or they may feel that a certain aspect of their gender can relate to certain aspects of volcanoes. For example, someone may feel that their gender is related to volcanoes if most of the times their gender feels like a peaceful and grand naturecoric gender, but occasionally it becomes fiery and chaotic. Sumendian people can have any alignment and/or no alignment, and depending on what alignment they have, they could use another term from The Nadurian System to describe themselves. For example, a sumendian person who is fiaspec could say they're rhosynic sumendian, from rhosynian.
The term 'sumendian' comes from the Basque word 'sumendi' meaning 'volcano'.