Mysterious chronicle (part 14)

Mysterious chronicle (part 14) 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 1573 of the Fourth Age. Bilrach says it has been forty years since his last entry, and since his efforts of setting up in the Furnished floors for his slaves, his breeding program has had a great success. He's taken the strength of giants, the skin of a goblin, and the size and basic intelligence of a human to create a new adequate, but much-improved slave. He has bred them to believe that pain is good for them.

Its likely he's referring to the Brutes and Rammernauts in the area, as the descriptions match them and they are unique to these dungeons.

Transcript
Year 1573 of the 4th Age:

Forty years have passed since my last entry and finally, this area is completely self-sustaining. A working chain of production has been created amongst my slaves. The digging should be far more efficient and, more importantly, I have a solid rearguard if any choose to come after me. As if anyone would try to follow in my footsteps now! On the subject of slaves, I've had great success in my breeding program. I've taken the strength of the giants, the skin of the goblin and the size and basic intelligence of a human, and created a barely adequate but much-improved slave. Conditioning has sped up progress also. I've even bred them to believe pain is good for them! They'll literally work until they drop dead where they are!

Zamorak be praised!