Mysterious chronicle (part 19) is a book found only in Daemonheim. It may appear in front of the dungeon-ending ladder after killing the boss monster.
Written in the year 1730 of the Fourth Age. Bilrach has reached a new area weak to his portal magic. He likely is referencing the Occult floors as he was previously on the Furnished area. He says using portal magic should be safe enough here, and that if the portal network is successful, he not only can dump the waste and effluence into another realm, but he can search for powerful creatures to guard his dungeon.
It is around this time that a lot of the boss journals were written, as Bilrach was bringing in the Kal'Gerion, Stalkers, and Behemoths.
Transcript
Year 1730 of the 4th Age:
A new depth has been reached and it is weak to my magic. Using portal magic should be safe enough here. If the portal network is successful, I can not only dump our waste and effluence into another realm, but I can search for powerful creatures to enslave and defend my great work here.
Zamorak be praised!
