One of the tasks Yusuf Zuck assigned to Khalil Schroeder was to find Tyler Nash because, in his telekinesis, Tyler Nash had disappeared; he was gone from Capital City, vanished from the entire Mainland. Therefore, whether Tyler Nash was dead or alive, hidden underground or lost deep in the four great wastelands, Khalil had to find out.
The second task was to investigate everything on the Mainland.
After delegating the two tasks and exchanging ways to keep in touch, Yusuf left the ruins of the former imperial palace, advancing invisibly and holding his breath toward the Northeast.
…
Four hours later, Yusuf returned to the secular world, back to Capital City!
"Whew—all is well!" Upon his return, Yusuf immediately employed Thought Overlay and then found out that everyone was present, everyone was fine!
Although he had disappeared for more than three years, since he was soul-bound with the Demon Cultivator, they could be certain he hadn't died.