Rohendel's Adventurer's tome


I am experiencing an annoying problem. I have been going around Rohendel killing monsters that are named in the tome but I have killed several and they do not register on the tome. I feel like I’m wasting my time because i need to complete 60% of the tome to get the song of eternity in order to get all the collectibles there…

Is anyone else experiencing this? Help :frowning: