So, there are two main way’s this can go, and while they are both similar – they follow the same general section for Infinity War.
Ky is on ‘loan’ to Thanos thanks to Meph and Thanos working together ( such as Meph being an ‘adviser’ to Thanos via lies linking Meph’s origins to the gauntlet and the infinity stones).
Ky spends most of the events ( until after the snap ) in Meph’s realm watching everything while eating popcorn. More or less under ‘orders’ not to leave. However, shortly after half the universe is destroyed of life he decides to ‘sneak’ out of Meph’s realm to see what happened with his own eyes.
A host, that was all he had ever wanted; something to hold onto the waking world with his own hands. He had one long ago, but was banished back into the fade, and that was where he had waited.
He had tempted several mages before, but they always denied him a host. It had to be willing, had to be a certain type, and had to be powerful.
Thankfully, with the Circle in ruins, he was able to attach himself to a young Apostate who was on the run from the Templars.
Now, he is free to do what he wishes in the world of the waking, but everything comes at a cost.
Eventually, his own pride will catch up with him — after-all, it’s in his title as a pride demon.
Once upon a time, there was a boy with an entire life a head of him, but it all changed in one night. A fire happened, lives were lost, and lesson’s were ultimately learned.
Ky’lar spend years denying what he was ; denying his rightful place until he came face to face with what he could do. It was the reason why he stopped trying to control himself and eventually he gave in.
It was that choice that lead him to taking countless lives due to his games; even more shocking was that Ky didn’t want to return back to his former life. To do so would have meant accepting everything that was done and he wasn’t ready —- didn’t know if he ever would be to honest.
A reason to why he was making a deal for a large plot of land; he needed a build something and with the Leviathan’s running around, it was best to do it while they were distracted hunting for the Winchesters.
The next thing he knew, he found himself in another world that he didn’t quite understand; worse than that though, he couldn’t even teleport out of the damnable place. A reason to why he isn’t just angry, he’s pissed off, and ready to find a way out of this place… no matter what the cost.