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philosopher's stone
A mythical alchemical substance that could allegedly transform base metals (most notably lead) into gold or silver. Depending on the source, it may also be a source of eternal life.
The Philosopher's Stone plays a major role in the plot of Fullmetal Alchemist. One of Patchouli Knowledge's Extra-stage spell cards in Embodiment of Scarlet Devil is also called Fire Water Wood Metal Earth Sign "Philosopher's Stone".
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