So, I got into the crypt where his soul jars are, and thinking myself clever, i threw them with telekinesis, shattering them all.
This has caused the journal not to update and the quest can't be completed, since all 5 jars are now broken but I didn't interact with a jar to break it via dialog menus.
Last edited by Coactus; 14/02/17 07:52 AM.