The death of the World Tree was even earlier. During the First Creature War, the World Tree perished, which was when its roots were stolen by the Dragon God, and the Phoenix Species left for the Northern Realm, roughly seven thousand years ago.
Why does Fisher speculate that Magic was born five thousand years ago? This needs to be deduced from the Soul Completion Manual of the First Generation Soul Minister Caleb Wuz and the clues Fisher obtained in the Northern Realm.
Compared to other Transferees, Caleb Wuz was a Transferee who crossed over very late, and Fisher didn't know the specific reason.
Fisher only knew that by the time he crossed over, Dragon Tail Island had already been separated by the Mother Goddess into the South Continent, and Magic had also spread to the South Continent, giving rise to the Dragon-man Species' unique Dragon-man Magic. Those Dragon-men had even asked Caleb about Human Magic, which he did not know.
