He was speechless, but I wanted to continue. To drive my point into him. "Another point I want to make is blood magic. Blood magic has many applicable ways to heal. For example, Arthur’s snake bite would probably be a lot easier to heal if one uses blood magic to pull the venom from his blood." I stared down at the book I was currently reading. "The difference between dark, mundane, and light magic is the toll it takes on the caster. Dark magic requires a sacrifice of the user. Light magic requires emotions." As an example, I summoned my Patronus and allowed her to fly about the room.