Book of everything

I don't think it's a bug, but definitely something worth flagging as feedback. Yesterday, I got a Book of Everything from one of the chests, and as you can see, I already had one in my inventory. I figured it was the perfect time to use it on my ongoing Archer Queen upgrade since these items disappear after 24 hours.

However, I found out that in the Hero Hall, you can’t use a Book of Everything to finish a hero upgrade if you also have a Book of Heroes. I tried everything—through my inventory, the Archer Queen post, and the Hero Hall itself—but nothing worked. The game only let me use the Book of Heroes.

In the end, I had to use the Book of Heroes and a Rune of Dark Elixir just so my “free” Book of Everything didn’t go to waste.

P.S. Heroes and a few troops are the only things I have left to upgrade.