Due to a system error, sy arrives in pidw 99999 years before lbh's birth.
His glitching system crashes and shuts down before he can even figure out wtf is happening, leaving sy stranded in actual primitive society, now cursed with immortality.
After all, he can't be allowed to die until his first mission begins. So what's the mission? Right... He has no idea because his system died before he could finish reading the message.
All he knows is that it has something to do with lbh.
So he goes about trying to figure things out. He has no special powers, but is quite literally indestructible--which he finds out the painful way. Multiple painful ways. Very very many painful and strange ways, over the tens of thousands of years during which he sits around waiting for the protagonist.
He may or may not have accidentally started a cult at some point. Got dragged into some political kerfuffles. Built some cities here and there, because he went through an engineering/architecture phase, out of sheer boredom. He might have invented paper or something, because he once watched some videos about historical paper making--or was it about block printing? He doesn't even remember any more.
Anyway, he waits and waits, and lbh just would not fucking show up. He's lost all sense of time. He can no longer tell if something happened a hundred years ago or ten thousand. He's worried even his memories of pidw would start to fade, so he writes down everything he can remember, and makes multiple copies, hiding them all in secured locations.
And over time, he's... built a bit of a reputation. Legends from multiple cultures all tell of an old, fallen god, forced to roam the mortal realm forever.
Oh yeah, despite his millennia of cultivation, he cannot ascend. It's like something is blocking him from it, probably his stupid mission that just. would. not. start.
No big loss, he supposes. He still has no idea what even happens once you ascend. Everyone who does is never seen or heard from again. What if it's just a big scam?
But his immortal existence can also be pretty depressing. Friends come and go. Kids he's adopted grow up and die within the blink of an eye. He stops adopting, not even pets. The early heavenly demons are somewhat more durable, but even they aren't truly immortal. Sometimes sy would accidentally fall asleep for centuries, then wake up bleary-eyed, unsure where or when he is, before he eventually ventures out again to go on some new adventures.
And some of those adventures are... um. Look, he gets really, really bored sometimes, okay? And somebody like him obviously shouldn't get romantically involved with mortals (and when did he start thinking of other people simply as "mortals"?) So, the responsible thing to do is to just have strictly casual relations. And since sy ain't no player, he limits his options to other men. Like, he's not gay or anything, but it's just the sensible thing to do. It's just a bunch of men helping each other out, getting some physical release together. And he's weirdly popular with men for some reason? Maybe they all got the same idea as him. Cool, cool.
And thus, the legend of an unfathomable immortal who cruelly toys with the hearts of men is born... Beautiful beyond comparison, ancient beyond time, but oh so terrible. Beware, O mortals, of the temptation that would be your ruin!
And sy, of course, assumes its just some funny story about a powerful succubus, or something.
And so he waits. And waits. And waits. And waits. And waits.
And during one of the century-long naps he takes, somewhere on the Luo River, a newborn is sent floating downstream in a basket...
Luo Binghe has not expected to see his own name written on an ancient scroll, locked inside an even more ancient fortress in the demon realm.
The fortress is in ruins, so old and battered it's barely recognizable as one. The scrolls are only preserved by some powerful magic, likely of heavenly demon origin.
Except, none of the characters on the scrolls look ancient. They're almost the exact same writing lbh himself uses.
All this weirdness pales in comparison to what the writing describes.
It's a exact, detailed record of lbh's own life.
Thing's no other soul should know. Things from his early childhood. From his disciple years. From those nightmarish years in the abyss.
Moments of his greatest shame. Moments of his greatest triumphs.
Then, there are the things that have not yet come to pass. Some are even accompanied by crude illustrations. There are sketches of *him*, not quite accurate but still recognizable.
And the scrolls claims he will go on to rule the three realms, even though lbh's world domination ambitions are still in their infancy at this stage.
What is this, some ancient prophecy? So many things feel so awfully *off* about these scrolls, but as lbh continues his bloody wars of conquest across the realms, he can only admit that they have their uses.
They tell him who would help, and who would ultimately betray him. The traps laid out for him. The damsels waiting for his rescue. Lbh feels like he is cheating fate. He feels like he's toying with something dangerous beyond comprehension, but he is not one to fear such things.
But where do these scrolls come from? Why were they created? Just *who* created them? As his power grows, lbh puts everything he can spare into discovering the secrets behind the scrolls that have inadvertently defined his life.
But he also has another more immediate problem to deal with. There are whispers that there is an ancient, elusive god in slumber, who is the only being that may be able to put a stop to lbh's supposed tyranny. Lbh wants to dismiss such myths as mere make-believe, but his scholars are less certain.
Well, if some ancient being does exist, then lbh will certainly root them out, and then either slaughter or subjugate them, like he's done with all the other false gods that dare to make noise in his domain, which at this point encompass the entirety of the known world.
Though, it's said that this one is also some sort of deadly seductress. Lbh snorts. Yeah, he's met plenty of those, too. Maybe this would prove to be the *fun* sort of subjugation after all...