Custom Blood Magic: Ritual

An Alchemist who has Mastered Alchemy 4: Mutate is able to uncover the legendary Philosopher’s Stone. Long lauded as the penultimate achievement of Alchemy, the stone is said to have legendary properties, including being able to transmute base metals into precious ones, as well as being the key to elixirs of life and human transmutations. Achievement of this level means that the Alchemist has learned how to create a Philosopher’s Stone, and can use it with creative and interesting effect.
System: By gathering a small amount of each of the 16 Alchemical materials, the Alchemist draws each of their symbols and then uses blood magic, a hidden key that mortal Alchemists were unable to replicate, in order to combine them. What results is a small, palm sized stone, colored blood red and iridescent. This stone will act as a key focus for any of the previously named materials, allowing a person to surpass the usual limitation of Alchemy: Mutate.
After creating a Philosopher's Stone over the course of an hour, the thaumaturge may later place the stone on another object and activate the stone through his own will.
An Alchemist may target any substance that they can touch with this stone, and are able to convert that substance into one of the 16 Alchemical substances: copper, lead, silver, gold, iron, carbon, tin, sulfur, mercury, zinc, arsenic, antimony, phosphorus, bismuth. The change takes between a few minutes up to an hour depending on the size of the object being transformed.
They may not change a material into something that is not one of the Alchemical substances. For example, one could change Iron or Tungsten into Gold, but could not change any substance into Tungsten.
The Philosopher's Stone only works for the Thaumaturge who created it, and must be destroyed before creating another. Creating another Philosopher's Stone destroys the first.