My main questions here are: Does the DC for identifying a creature use the specific creature's HD or the base HD for the type of creature. If it does use the base HD then what would the DC be for a creature that does not have a base HD. dnd-3.5e monsters skills...
It is harder to tell in the cases of Titivilus and Yan-C-Bin however because we do not know what the "average example" of their type of creature is. We don't actually need to know what an average Titivilus type creature is just that Titivilus is not average. I...