Battle Through the Heavens: Purple Heaven Thunder Emperor

A young man was transported to the Dou Qi Continent by a Purple Heaven Divine Thunder Talisman, becoming the adopted son of an ordinary member of the Xiao family. He achieved the highest level of Thunder Dao by using the nine Thunder Seeds within the talisman...
after many years
Soul Emperor: "Impossible! The Dou Di Cave hasn't even opened yet, how could you become a Dou Di?"
Xiao Bai: "Look carefully, I'm at the Ancestral Realm, not the Emperor Realm!"
P.S.: Without cultivating the Burning Technique, one first reaches the Ancestral Realm, then the Emperor Realm, merging the two paths into one, and ascending to the Great Thousand World.