The one example I have of this is whenever you are on challenge 3 facing Ol’ Rattleswipe he will eventually play a legendary minion called Pip. I waited until he played Pip before killing any other minion and killed Pip first before any other minion and upon dying he spawned a lorebook called First Mate’s Log which gives details of Pip’s interaction with Ol’ Rattleswipe in which he notices him talking about snake armies and a woman’s voice calling him to find some relics as to provide additional lore to the overall story. If there is anyone else trying to locate all of these lorebooks, this is a good one to try and go for if you are stuck trying to find more. I will try and experiment with other battles like this in an attempt to discover more lorebooks from other legendary minions for the other chapters. I encourage others to try and discover them as well.

I can see how that is annoying. Each of the lore books have specific names so it is possible to track where each drops to try and get an overall list. Right now I don’t think there is enough interest to try and find them all. I just want to confirm somehow that they are all possible to get and it isn’t bugged.

You have to trigger them correct.

I have all achievements complete for the book of heroes except the Restless Reader in which I am currently at 25/40 total. I am noticing there are some books that drop randomly from minions and there are some that I have found that drop from legendary minions as a rare drop. I can’t find any information of anyone who is tracking where each are found yet.