I actually really like the idea of beasts. Hmmm..... I hadn't thought about adding a supernatural element into this world, and I don't want to take it too far (this doesn't feel like a high fantasy setting to me), but I might add in some creatures that don't exist in our world, if there are no objections. I personally believe it would be awesome to see how people react to some creepy crawlies or something of the like.