Settings often contain elements based on real-world mythology, and the series features many allusions to religion. A notable example are ancient mythological creatures that function as summons, and have various different roles within the game lores. Espers from Final Fantasy VI are a magical race that once lived alongside humans until a war wiped most of them out. Aeons in Final Fantasy X are the physical realizations of the dreams of the fayth, and summoners use them to battle Sin. Many games featuring summoned monsters do not have them as a named race, or give them a key role within the lore, the summons being merely abilities to be used in battle.
According to the in-game backstories, the world of Hyrule was created by the three golden goddesses: Din, Farore, and Nayru. Before departing, the goddesses left a sacred artifact called the Triforce, which could grant powers to the user. It physically manifests itself as three golden triangles in which each embodies one of the goddesses' virtues: Power, Courage, and Wisdom. However, because the Triforce has no will of its own and it could not judge between good and evil, it would grant any wish indiscriminately. Because of this, it was placed within an alternate world called the "Sacred Realm" or the "Golden Land" until one worthy of its power and has balanced virtues of Power, Wisdom, and Courage in their heart could obtain it, in its entirety. If a person is not of a balanced heart, the triforce part that the user mostly believes in will stay with that person and the remainder will seek out others. In order to master and control the triforce as a whole, the user must get the other parts found in other individuals and bring them together to reunite them. The Sacred Realm can itself be affected by the heart of those who enters it: those who are pure will make it a paradise, while those who are evil will transform it into a dark realm.