After arriving at Sky City, Saine first paid a visit to the Arcane Light.
He uploaded the fruits of his research from the past several tens of thousands of years to the Arcane Light.
Back when Saine had been at a lower level of life, he had cherished his broom as if it were a treasure, somewhat reluctant to part with the Truth Arcana he possessed.
But as Saine advanced to a higher level of life, with the knowledge he grasped becoming ever more profound and the fields he touched ever broader, he instead lost those views he had held in his youth.
Because compared to monopolizing knowledge for oneself.
During his several tens of thousands of years in Despair World, Saine had come to cherish even more the chance to sit and discuss the Dao with powerful peers, exchanging insights with one another.
At this time, Saine left some of the cutting-edge arcana he had mastered in Sky City.
Perhaps at this stage, Wizard World still had no one capable of understanding Saine's Mechanical Fusion Arcana and Ashes of Fire Profound Truths.
After all, in the former at least, he had already reached the very forefront of this academic field in Wizard World.
But if, after some years—say, several hundred thousand years later, or even a million years later—there were powerful figures in Wizard World in related fields who also reached a level similar to where Saine stood today.
When they looked upon the academic achievements Saine had left behind in Sky City, how would they understand them?
This was a dialogue spanning time and space.
Saine had no way to traverse time and space and communicate with certain figures of the future.
But through the inheritance of knowledge, he could preserve his own academic ideas and Truth Arcana.