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I made this theory for some past deepestlore threads,
I'll repost here since this new trailer got me hype and made it seem like we might actually get it
(1/2)
This is the Ouroboros
It's an ancient symbol depicting a serpent or dragon eating its own tail.
It has a lot of meanings in cultures around the world, and I think several legendaries, especially Zygarde, took some inspiration from it's concept and symbolism
It represents the infinite cycle of nature's endless creation and destruction, life and death (Xerneas and Yveltal)
The famous early alchemical text "The Chrysopoeia of Cleopatra" depicts it black and white halves represent the Gnostic duality of existence
(Reshiram and Zekrom)
In India, Ouroboros symbolism has been used to describe Kundalini energy, a form of Primal Energy located inside one's own body.
Different spiritual traditions teach methods of "awakening" kundalini for the purpose of reaching spiritual enlightenment and a range of supernormal powers.
(Mega Evolution/Infinity Energy)
Now it's relation to Norse Mythology is where it gets intresting