Soul Stone

An object that has the ability to manipulate the soul and essence of a person, control life and death, and contains a pocket dimension called the Soulworld. The Soul Stone (orange) is first seen in Avengers: Infinity War. It is revealed that at some time in the past, Thanos tasked Gamora to find the Soul Stone, as there is little record of its existence compared to the other Infinity Stones. Gamora found a map leading to where it was hidden: in a shrine on the planet Vormir, but chose to destroy the map and not to tell Thanos; only telling Nebula of it and swearing her to secrecy (later realizing that Thanos wasn't fooled by their lies). After Thanos captures and tortures Nebula, Gamora agrees to take him to Vormir, where they encounter the Red Skull (having been transported to the planet by the Tesseract and cursed to serve as the Stonekeeper). Thanos reluctantly sacrifices Gamora in order to fulfill the requirements to obtain the Soul Stone once the Red Skull explains to them that the Stone requires the sacrifice of a loved one to earn it. After completing the Infinity Gauntlet, Thanos is briefly transported into the Soul World and encounters a vision of a young Gamora. The Soul Stone is later destroyed to prevent further use.