also the hunter of hunter's oath rune, which increases your stamina's regen speed.
they even use the same fucking blood magic, and maria revives their lost practice of mire magic which you can see with the chalice dungeon boss pthumerian elder.
the entire point of the chalice dungeons is to expose the link between yharnam the city, the pthumerians, and the modern day nobles of cainhurst.
when we join the covenant of cainhurst when she mentions "feel the spreading corruption burn" she's not meaning her blood is corrupted, but that her blood is purging you of corruption.
which it does, as apparently bloodtinge was supposed to be "blood quality" denoting how pure your blood was not how corrupt.
this is why i hate translation errors.