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Loki tricked Odin into changing Thor into a female and discovers an elaborate Celestial manipulation on a cosmic scale: ancient humans were modified by the Celestials, given the ability to develop powers in order to act as a type of anti-bodies meant to stop radical elements such as deviants and alien species from harming the Earth and the Celestial embryo growing within it. Along with Earth, the Celestials modified the native species of many planets harboring Celestial embryos. Species affected by Celestial modification gradually undergo an evolution process where they develop powers either through natural means such as mutants, or unnatural means such as meta-humans like Spider-Man. Species with Celestial modifications in theory hold enough power to rival the celestials, but are inhibited by a clever psychological safeguard put in place by the Celestials. The safeguard relates to constructivist philosophy, that essentially states that people are shaped by their environment. The deities and devils within the Marvel universe are species that were modified by Celestials and unwittingly inhibit their own abilities due to the fact that they self-identify as a Marvel deity or devil. These evolved beings hold their sense of identity being reinforced by those that interact with them. Loki realizes that he was only the evil son of Odin and a Norse God because when he evolved beyond his mortal form and his psyche became a tabula rasa. The first interaction that he had with another in that form were Nordic humans who thought that he was an evil god and thus he became one.