Philosopher's stone, Little Alchemy Wiki

Philosopher's stone is an element found in Little Alchemy 2. It is available to unlock after purchasing the content pack Myths and Monsters. Immortality + Rock Immortality + Stone Immortality + Alchemist Philosopher's stone is used in recipes of: Air + Air → Pressure Earth + Pressure → Stone Immortality + Stone → Philosopher's stone

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I think I may have figured out where Marlo got its name from : r/WelcomeHomeARG