Several innocious questions, [@Kingfisher]
1) Is Demonblood literally just blood of demons?
2) Do vampires posess a classical weakness to being stabbed through the heart with a wooden stake?
3) In the ingame universe, is there sound information about origins of all the creatures that we'd consider "supernatural"? Are various species, powerful magics and the realms of fey, undead and demons completely mundane parts of the universe that can be explained through science and logic or are they something that is alien but exists nevertheless due to some other reasons?