hi thanks so much for yur feedback ^^
I guess it's a bug, but yeah, help yourself and get as many as you want xD scrolls give some xp and eventually some extra skills (up to a limit)
there's a secret zone you can get in when you have just completed the game hehe, so you unlock the foes you fight with, you'll get them there so you can play with them at will, it's called the sandbox mode :D