EarthClan cats are descendants of ShadowClan. A long time ago the Clan cats split up, and Lionstar raised his children to search for the Clans. Waterkit, Earthkit, Firekit, and Airkit all listened to him closely. Soon they set out. Earthkit, now Earthgrower, gathered the descendants of ShadowClan and created EarthClan, becoming Earthstar. His siblings gathered other descendants of the first four Clans and created WaterClan, AirClan, and FireClan. The night-dwellers today are living in a crack in the earth from an old earthquake.