The Truth

Truth is the most commonly used name for the mysterious and ethereal being that sits before The Gate and addresses alchemists who have stepped into God's domain through the use of alchemy. It appears as a pure white, nearly formless being almost indistinguishable from the rest of the endless white expanse which surrounds the Gate but for a shadowy outline which causes Truth to reflect the shape of the person it is talking to, thereby supporting its claim to be another shade of that very person. When Edward and Alphonse Elric each appeared before the Gate, Truth took on the shape of a young boy and when Izumi Curtis appeared, Truth's shape reflected that of a young woman, appeared as a vigorous man to Roy Mustang, and a white version of Father's flask form.

Truth initially introduces itself as the being some people call God, the World or the Universe, at first seeming welcoming and jovial to its guests before calling attention to their hubris and opening the Gate, which forces them inside. At this point, Truth often smiles with an eerily wide and insane grin that is similar to that of the Homunculus Gluttony and Father's flask form. When the alchemist in question returns from his or her sojourn through the Gate, Truth informs them of the necessary toll for accessing the Universe's knowledge and collects it, usually in the form of a body part which disintegrates off the alchemist and reappears on Truth's form. In this way Truth is responsible for the taking of Edward's left leg and right arm, some of Izumi's internal organs, Jude's eyes and Alphonse's entire body. However, due to the fact there seems to be a different Truth for every person, it could be suggested that there are multiple Truths. It would appear that Truth's goal is to discourage humans from treading in God's domain, as it calls Edward a fool when the young boy returns and sacrifices his arm to recover his brother's soul.

Though Truth appears in Edward's dreams, mocking him, his next true appearance is in Chapter 53, when Edward crosses to the true Gate from inside Gluttony's internal imitation. Truth appears amused that Edward has not come to retrieve anything that he lost on that day four years ago. Interestingly, Truth does not seem to appear before Edward as he discovers Alphonse's Gate and the body that sits before it, but - as the body speaks to him even while its soul is in the mortal plane - it is likely that what Edward sees and speaks to is Truth wearing Alphonse's body just as it wore Ed's limbs, especially since the body is seated in the same manner as Truth whenever it appears.

In Chapter 102, Father discusses the irony behind the works of the 'Truth', who took Ed's way to 'stand by himself' and his 'only family', Al's body so he 'cannot feel the mother's warmth as he craved', Izumi's 'capacity to bear a child' and, now, with Mustang, coming full circle, 'depriving the man who had a grand vision to save his country from his eyesight, denying him to see what his beloved nation will become'.

In Chapter 107, Truth appears once more before Alphonse in his restored body. It returns Edward's arm in exchange for Alphonse's soul, and mockingly questions the younger Elric if his brother will return for him and what he'll sacrifice. In Chapter 108, Truth appears before Father and mocks him for trying to claim the power of God for himself. He then banishes Father to depths of the Gate, where Father had presumably come from. Truth also appears before Ed and asks what he'll give up in order to bring back Alphonse. Edward confidently marches to the Gate and declares it as his toll. Truth seems a little startled by this and asks if Ed will be all right without alchemy. When Ed says he will because he has his friends, Truth gives him a friendly smile and fades as Ed loses his alchemic powers.

Trivia

 * The Truth appeared in an extra in volume 18 of the manga where it showed Yoki attempting human transmutation and having his hair taken as a toll.
 * In a late interview with the author, Arakawa said the Truth was somewhat a 'hollow' version of oneself (as a sort of 'internal God', or conscience), a sort of 'negative' of that alchemist, which completed itself with the tolls taken by the alchemist upon seeing the Truth.
 * The Truth shares the same English voice actress as the 2003 anime's version of Wrath, who was also responsible for taking Ed's limbs in that series.
 * For some reason, in the 5th Fullmetal Alchemist: Brotherhood theme song "Rain", Winry appears as Truth.