Cumulophidians are a race of ophidians said to be descendant (or even jokingly, ascended) from a reclusive snake people living in the jungle following their explorations into the sky. A mixture of the great sky serpent blood infuses their very bodies, allowing them to reduce their form to a gaseous state for a brief time. When playing a Cumulophidian, decide how exactly your serpent features present. The main idea was Yuan-Ti mixed with Air Gensai from Dungeons and Dragons, but you can go full on snake people made of cloud stuff if you want.