Not only dropped by Forgotten warriors[]
Title; I got Marmaros and Thok 4 in floor 15 (abandoned 1), in a Dead end with key room, from a Zombie level 67, C1 Small dungeon. It's either dropped humanoids or all kind of monsters, or other kind of pattern Talk Habblet 16:17, March 31, 2012 (UTC)
What Floors They're Found On[]
From experience, I think that the 1st of these journals is only found on floors 1 to 6, the 2nd on floors 7 to 12, the 10th found on floors 55 to 60.
Can anyone confirm this/ disprove it, so it can be added to the page. —The preceding unsigned comment was added by De jour (talk) on 14:57, April 12, 2014 (UTC).
https://pbs.twimg.com/media/CVo65mKUEAAARGv.png
https://twitter.com/JagexManti/status/673915856267649024
Perfect dungeoneering potions (and perfect+) do affect the chance to get them, floor difficulty does not.