it just happens that I built my blood altar at a less-then-optimal place but I don't want to tear everything down again. NEI showed some kind of pipes for/from blood magic but I haven't seen anyone mention them, does that mean they are still a WIP?
Right now I intend to "manually" get my altar up to tier 4, make a teleposer and use that to teleport villagers under my blood altar block. The stabbing will be done by a Autonomous Activator and everything can be shut off with a lever.
Or is there a way to kill villagers somewhere and save the "blood" in the AE system?
It kinda feels... efficient?... to store all that live somewhere.
Man, now I feel so evil just for thinking that.