there's the transmigrated chinese precedessor who transmigrated before and used to have MC's cheat & there are chinese writting left by him. But there are some differences. E.g. unlike LotM, MC doesn't need Visitators to collect diary pages for him, because he found from his Visitators where his precedessor's item (autobiography) is and he also got precedessor's painting by chance that also showed some secrets and he got pretty much everything from these two items

The world used to be a cultivation world over 3 (?) thousand years ago, not sure what exactly happened but so far it turns out like some kind of another dimension invasion not sure, not only making the era of spirit qi slowly fade, but these immortal-devouring beast/s appeared and hunted down old fogey immortals. The world then entered beast era. There are still some surviving but they're hiding, because if they use any immortal technique they will be wiped out. At chapters 439 MC so far he met 2 old immortal fogeys who never left these continents, he also started cultivation but has been warned by a 3700-year old fogey that if he continues he will meet peril, as to what peril he has seen it because the old fogey has been soon hunted down by a beast from another dimension.

@edit after chapter 594 RAW:

Indeed, there seems to be some kind of outer land, just a border place behind deadly miasma that sets boundary between outer land and the continents but still in the same world where immortal cultivators escaped to during the great calamity. But they're not really prospering there, it's kind of holding on. They're afraid to step into Middle Earth continents too due to the Immortal-devouring beast that eradicated cultivator era there and made the beast era rise. The Middle Earth continents is basically the world MC currently is in. Two immortal cultivators are pulled to MC's Visitation Hall and they are disdainful and view the people they see there as mortals. Interesting, interesting. Also, we get to know much more about Daojun, the previous transmigrator who held MC's cheat.

@edit chapter 619

The calamity has been actually triggered by some immortal emperor, who thought he can replace heaven, so he went against heaven. Apparently some heavenly tribulation struck, wiping out thousands of highest tier mmortals, the heavenly emperor could endure it, but he still perished either way. And then the immortal devouring beast started hunting the rest immortals, the war continued for hundreds of years and immortals obviously lost. There was some kind of Nine Heavens Profound Realm with palaces etc where those venerable immortals lived back then.

there was one big city family that didn't pursue the matter of MC stealing their premium medicine and later he ended up returning the favor because of that benevolence

there was a buddhist temple that got tricked into provoking MC and MC actually wanted to raze to the ground while they wanted to get rid of MC etc but the arc ended with them parting on friendly terms / as allies lol

MC also planned to subdue monsters' force and he even killed some, it looked like it would end with a clash against their leader but he ended up friends with their leader and they just started reforming the force

in the modern world if they succeeded stopping the calamity (end of the beast/cultivation world) ? also what was the points of fighting all these antagonists and saving friends if the world was about to end anyway after 8 years haha

he would give the visitators more screentime like in Lord of the Mysteries. They're basically almost entirely leeching off MC and doing some errands at best, in the last 150 chapters they became small fries, we weren't even shown conversations between them, I expected them have a much bigger impact on the events but it seems like they just get one arc each to shine and that's it.

even a proper fight scene between Xiao Huo and the Immortal swallowing beast.