Iuchi Dong-Ha wrote:a) I don't think such path exists in 4th edition
b) intelligence is highly debatable, but because the GM need to find some limitations to the maho for the sake of balance, so far in these games the blood has had to come from humans (or in one case, Togashi himself). If anyone could have a trivial access to large blood pool, much of the maho would become a balance issue.
Listen, the guy who designed the game more or less stated that game balance wasn't a thing he believed in

Also, maho is already decidedly imbalanced, it's not like easier access to blood from a game design standpoint makes it radically more imbalanced.
Unicorn Clan | Bushi | Permanent Injury | Hero
Honor: What is expected | Glory: 3.0 | Status: 1.0 | Courtship Points: 1 "Want to be a hero? I have some advice for you. It hurts like hell."
MekhemEquipment: Daisho, tanto, flute, sturdy clothing, sake cup
Character imageSetem- his HorseDescription