Maddening Questions

Maddening Questions is a tome in Diablo III that can drop from any Unique Monster in Set Dungeons.

It reads as follows:

''I found more of the enigmatic portals. They are hidden yet everywhere. They call to me, but to set foot into them is to be drawn deeper into the mystery of the dungeons that lie beyond. I cannot think of anything else. I should find a way to close the portals, if only to save me from myself.''