The previous is why Mylene when in alchemist "mode" looks at Aster as if she is seeing a mysterious fantasy creature, and seems to want to cut him up to study how his body works, very much to Aster's amusement, it's because his blood is simply a priceless treasure that even at mortal level can produce incredible results when added to other things.
And it's not even limited to a single aspect where it focuses all of its power, like it happens with Vivian, though that white-haired girl can make up for it given the basically limitless variations for which her blood can be used though they would all be medicinal, toxic or alchemical related.
