Mysterious chronicle (part 21) is a book found only in Daemonheim. It may appear in front of the dungeon-ending ladder after killing the boss monster.
It was written in the year 1890 of the Fourth Age. One of Bilrach's portals malfunctioned and a race of troublesome creatures came in without him noticing. They call themselves the gorajo, and they were against him from the start, as their culture despises necromancy and demon summoning. They are good at hiding, which will make it a long fight.
Year 1890 of the 4th Age:
I hazard to call it a disaster, but something grossly unwanted has happened. One of my portals malfunctioned and a race of troublesome creatures crept through without me noticing. They refer to themselves as the gorajo and they maneuvered against me from the very start; their culture despises the reanimation of the dead and the summoning of demons, it seems. The backward fools. While my powers are great, they have a habit of keeping out of sight, so I fear this will be a long fight.Zamorak guide me!