If the Baroness considered that femur some kind of healing tool, her satisfaction clearly went beyond a single treatment session. She exhausted herself on that bone until she nearly passed out on the bed; the scene resembled less a peculiar fetish and more a sacrificial rite from some dark cult ritual.
Lancelot could confirm that the femur held some special significance, perhaps even a holy relic of the noblewoman's secretly worshipped deity. He considered stealing the bone to examine it but quickly laughed off the idea. The revulsion wasn't the only reason; both the Scholar and the Priest had mentioned that objects related to the Evil God were extremely dangerous, with non-believers' merely touching them likely inviting powerful curses—even someone of his Foundation Establishment Stage might accidentally fall victim.
For now, knowing of the bone's existence was enough to dispel Lancelot's last doubts about the Baroness.