[@Nanashi Ninanai]
I really know too little on GO. Forums are my only source since I can't read Japanese and that's kind of a turn off even though I love the Fate series.

I don't remember if Rin has affinity with all elements, but instead the spells she casts with her gems are based on the gem itself (I.E. ruby = fire; emerald = wind) as her origin is neither of the basic elements, although I don't remember if it's Nothingness or Emptiness (this was found in a side material btw). And Paracelsus is exceptional in the fact that he can create the Philosopher's Stone with alchemy, so he can do a lot of crazy stuff.

Just don't remove her blood creating an army as that was unexplored in GO even though it states that she can do it. It would be interesting to see her commanding an army of her own.