Cain had forgotten one vital fact about the books created using the Inscription desk. They became unusable texts an hour after they were created. He had never waited long enough to see what happened once one timed out, but as he ate dinner and the Sect Master worked on memorizing the tome, the hour-long time ran out on the first book that Cain had created.
[Time Limited Item has expired] Tome of Emergency Resurrection
Cain saw the notification and realized his mistake, but the Sect Master was still reading without any issues.
Cain checked his inventory and removed the second tome, seeing that it still had most of its hour left, so the Sect Master definitely had the older one. He marked his page with a bit of silk, closed the book, and set it down to take a drink, so Cain used his System interface to check on the status.
[Tome of Emergency Resurrection] Expired, cannot be equipped.