AgentofSocialMediaChaos's Anime Girl of the Day Season 3 Episode 67 Echidna

The Philosopher's Stone is a fictional magic stone created by alchemy that can allegedly grant immortality. In addition to appearing in this series it appears in Fullmetal Alchemist, Is It Wrong to Try To Pick Up Girls In A Dungeon, and Harry Potter. Stories involving it date all the way back to 300 AD. Back then people thought it was real though

@AgentofSocialMediaChaos: Harry Potter lol. I watched Girls in Dungeon not too long ago. Damn good show. I don't remember a stone but I likely didn't notice. Too many waifus to be distracted by a stone :)

@Toki: It's only mentioned in Is It Wrong To try To Pick up Girls In A Dungeon. One of the characters in the 3rd season of the series is a hooded skeleton named Fels. Fels backstory is he used to be human but he obtained immortality thanks to the philosopher's stone but at the cost of his humanity since it only granted eternal life but he still aged