They used alchemy to create a Philosopher's Stone - an item that will allow alchemists to bypass Equivalent Exchange, and transmute nearly anything to whatever extent they see fit. It's an incredibly powerful artifact, and not one to be used lightly.
The creation of such a thing, however, requires human sacrifice; the Stone is made out of human souls.
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They used alchemy to create a Philosopher's Stone - an item that will allow alchemists to bypass Equivalent Exchange, and transmute nearly anything to whatever extent they see fit. It's an incredibly powerful artifact, and not one to be used lightly.
The creation of such a thing, however, requires human sacrifice; the Stone is made out of human souls.