After roaming around together for close to 500 years, the journey between Bai Chen and the Bluefin spine-tailed swift came to an end when they ventured into an ancient ruin, which ended up being their last adventure together, with the ruin serving as the dying grounds of the swift.
It was unknown what transpired inside the ruin as the entire ruin was rumored to have been hidden by a saint-grade artifact that isolated the ruin. It's unknown if there was truly a saint-grade artifact in there, but Yang Qing was inclined to believe there was since not even the Order's report could cite what happened in there.
Bai Chen's story had been dug out through old-fashioned investigation, with a flying shadow hawk member retracing his steps, but also through tracing his karma for confirmation and extracting details that would otherwise be difficult to uncover through conventional on-the-ground investigation.