The first boss has a mechanic that is difficult to deal with for people with poor eyesight. It is both the shooting symbols that show the direction of the hidden books, and the glow on the books themselves. The symbols fire off a bit too seldom for many to gather in which direction they are heading and when they do, they are pretty small and dimly lit, making it difficult for many to actually see them. Since this is imperative to know, the way they signal direction would stand being reworked so that they are clearer; for example they could keep shooting instead of going out for just a moment and then pausing, as well as their lights being brighter - alternatively the strands that they "leave behind" being somewhat thicker and brighter, or why not all three to make it less confusing and eye straining. The books themselves that preferably two DDs go to find, would also benefit from becoming a bit more clearly marked out. For example, they could have a pulsating light emitting from them, and a sound effect on them. This would help many groups clear this mechanic, without sacrificing the mechanic itself.