The Tree Clan is one of two tribes of Prone encountered in Xenoblade Chronicles X. They are belligerent but proud Prone people with blue skin and a strong connection to nature, differentiating them from members of the Cavern Clan, their rivals. Since they began opposing the Cavern Clan, the Tree Clan has been devastated and imprisoned by the Ganglion. They build an alliance with the Humans and move to New Los Angeles after being freed where they can be seen working alongside the Ma-non.