Philosopher's Stone

The Philosopher's Stone (賢者の石, Kenja no Ishi), also known by various other names such as the Red Stone, the Fifth Element, also the Sanguine Star according to Rz Rashid as shown in The Sacred Star of Milos, and the Grand Elixir in its liquid form and many more, is a powerful transmutation amplifier appearing in both the anime and manga. Due to the absolute law of alchemy being equivalent exchange, the stone gives the illusion that someone is able to override that law. Being that it is an illusion, the powers of the stone itself are not unlimited, and only appears to allow an alchemist to bypass equivalent exchange as long as the stone retains its power. Many of the main events in the series revolve around the Elric brothers' attempts to obtain this stone, in order to gain their original bodies, of whom had to be paid to the Truth in accordance to the laws of alchemy. It is also noted that the philosopher's stone only amplifies the abilities of an alchemist according to their skills and ability. This being the case it may not always work while bringing a human back to life. If a solid body isn't present it will not work and sacrifices will be made to substitute.