Obtaining this book, and the 4 others, is required for the Master Quest Cape. You must read this book before you will be able to obtain the next one. You do not need to be on Slayer assignment to obtain these journals.
Below is the text you can read from within the book.
Menaphos continues to fascinate me - its mythology and, most importantly, its gods. There is one, Amascut, named now as the Devourer, who has left her mark on the very essence of the people here. A foul corruption has spread across their bodies and threatens their souls.
It is not a useful ailment. It damages the souls, leaves them weak, vulnerable, and ultimately unfit for my experiments. A pity. Fascinating, but ultimately problematic.
Another, more active, deity is the one I have encountered many times on my journey back to the Underworld: the dog-like Icthlarin.
An interesting sort, obsessed with guarding the souls on their journey to an afterlife. He seems burdened by an ancient guilt; perhaps that is why I feel a sense of kinship with him?
I wonder if he realises the sheer power at his disposal.
If he just wanted... If he just reached out and used the vast energy flowing through his domain on a constant basis, he could rival any of the other so-called gods.
Even Saradomin himself would fall.
Ha, listen to me, ever the blasphemer!