Medieval Demonology - a precursor to Role Playing Games?

The other day I was surfing wikipedia and I stumbled upon one of those articles that has way more detail than necessary.  Actually, to be more precise, it is a series of articles.  A series of articles on demons.  Apparently, some guys in Medieval Europe wrote a bunch of books on the subject, and at least one of these has pretty much been transcribed onto wiki, the Pseudomonarchia Daemonum, printed in 1577.  I don't think this kind of stuff was religious study as it appears; I think it's the equivalent of playing Dungeons and Dragons back in the day.  I mean just look at this stuff:

The bear looks embarrassed.