Soaring to the Nine Heavens

A youth from Earth is reborn in the Azure Sky Continent, which is not a new world but Earth's past, shattered by a great war; Earth is merely a fragment. The protagonist, Xiao Chen, descends from a Martial God ancestor who left behind the Azure Sky Sword, enabling his rebirth. In this era, the highest publicly known realm is the Venerable Realm, with hidden experts at the Unity Realm, but none at the Martial God Realm, because an ancient war wiped out all Martial Gods. After avenging his crippled body, Xiao Chen joins a sect, befriends others with special physiques, and together they uncover the truth of that ancient war. Rising to the Martial God Realm, he battles the villain, causing the Azure Sky Continent to shatter into many small worlds. In love, he has one beloved and one fated but regretful connection. — Description from novelcodex.org