The Heavenly Clan was never completely detached from the land; rather, every once in a while, they would send an envoy from the Heavenly Clan to the land to select a noble, a person trustworthy and vested with a certain degree of power, and to accompany this chosen individual through chaos before they could return to Sky City.
The main purpose of this Heavenly Clan envoy was to act as the sole bridge between the land and the Heavenly Clan. Since its inception, Sky City was destined to one day fall, as it descended after every fixed period. At first, the rate of descent was negligible, but as time progressed, Sky City began to drop faster. The diminishing distance from the ground resulted in many newborn Heavenly Clan losing their ability to fly.
This was when, in times of such dire straits, such a bridge became necessary.
The Earl was the one chosen by the Heavenly Clan's envoy, an outstanding and handsome man with both potent dreams and power—he was unsurpassed from the start.