“Subrosians are the native inhabitants of the subterranean lava world of Subrosia in both Oracle of Seasons and Oracle of Ages, the majority of which live in Subrosia Village. Subrosians are very secretive, and therefore always wear full-body robes keeping their physical identities private to all but themselves. It is rumored that they originated from the land of Holodrum, because foreigners can only enter Subrosia through stylized portals in Holodrum itself.
“As their habitat suggests, Subrosians enjoy symbolically “hot” activities, such as dancing, as evident from their Dance Hall, and partaking in lava baths. Their volcanic climate and their general isolation from mainstream society contributes to their use of Ore Chunks as currency as compared to the Hyrulean Rupee, as it is more abundant in the area and vital to their continuity as a culture, as Rupees are to Hyrule.”
— Zelda Wiki