Fullmetal Alchemist: Brotherhood still stands as one of the best and most popular anime series of all time, as its lofty rank on MyAnimeList.com would suggest. Aside from excellent production values and a stellar soundtrack, the anime also boasts a meaningful, complex, and memorable combat system centered around alchemy, the supernatural act of rearranging matter at will. Alchemy can take many forms, some of them extreme and brutal in world-changing ways. The Philosopher's Stone, for example, is the ultimate expression of equivalent exchange, but not in a way heroes like Edward Elric would like.
Source：https://www.cbr.com/fullmetal-alchemist-philosophers-stone-facts-info/
