I think there should be a book that tells you everything to know about blood magic like how craft certain items in the blood altar or what different rituals do. I hope to have a blood magic book like the lexica botania from the Botania mod. I think this book should be made by placing a book in at least a tier 1 blood altar

There are books that are WIP, and will be finished as soon as I get back around to writing them. With all my mod packs built, that should be fairly soon.