Noted! Your welcome!
Yeah, I love the fact that even he, like us watching part of the artworks, can't explain what he is XD. And the fact that he was alluded long ago makes sense retrospectively: when we search for rumors about the beast talking with Harold, Lenny reports that the saw a transformation of a being. We think is a werewolf from the forest, but in this universe mature werewolves (like Caleb or the Alpha) don't transform!