Mysterious chronicle (part 16) is a book found only in Daemonheim. It may appear in front of the dungeon-ending ladder after killing the boss monster.
It written in the year 1645 of the Fourth Age. It has been centuries since Bilrach has awoken from his sleep mentioned previously. He has heard nothing of the other Mahjarrat, which must be why Zamorak chose Bilrach as second in command. He believes the creation and summoning of K'ril Tsutsaroth proves it, but that his current actions will confirm it.
Bilrach can still sense the presence of K'ril, he finds this strange because he believes the God Wars are over and doesn't know the God Wars Dungeon exists.
At this time K'ril would still have been frozen in the God Wars Dungeon, as it was not until the year 169 of the Fifth Age that it thawed out completely.
Year 1645 of the 4th age:
Centuries have passed since I awoke, but, still, there has been no sign or word of the others. Pathetic. I see now why He chose me as his second in command. If the creation and summoning of the mighty Tsutsaroth demon for Him wasn't a sign that I am worthy of that title, what I am doing now will be. None of the others dare to do this; none of the others have power to do this; none of the others have the focus to do this.
They settle for scrabbling around with what is left and they will be punished for their lack of faith. Curious, I still feel the presence of K'ril in this realm...Zamorak be praised!