After a formations grandmaster become famous, it was too simple for him to accumulate cultivation resources. This was especially true for such a famous grandmaster like Di Tian.
During these days, he forged relationships with many major powers and didn't exhibit any of his tyranny and brazen attitude when he went to challenge the Yan Clan. He was polite and humble, and when the major powers invited him to inscribe formations, as long as the price was right, Di Tian never rejected anyone.
At the same time, he also made many friends. An example was the Mo Clan. Mo Junyi would often visit him and invite him to her Mo Clan. He would also frequent transaction Pavilions to exchange for treasures. Unknowingly, the cultivation resources he gathered became more and more, he eventually bought a pretty large piece of land in the central city regions and after some modifications to it, that place became his resting place.
TL Note: The Di帝 in Di Tian's name, stands for Emperor.