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After having used the combination spell [Summon Angelic Yggdragon Aura Manifestation] with the help of Katherine, Elayne was able to "summon herself" through such miraculous power. An extension of her own aura that gained its own independence to an extent, but that still containing her own mind, and an extension of her soul.
In summary, it was the same as the Yggdrasil Clones she had created in BNLO, which helped her at doing many things at the same time by dividing her own mind, or sometimes by giving them a direct task that they would do automatically.
With this, Elayne had the idea of using her Soul-Bound Skill [Sacred Spirit Queen Of Divine Beasts] and "tame" this clone of hers, perhaps to "keep it permanently" without realizing the consequences that such a thing would bring!
FLAAASH!
And upon using the Skill once and successfully creating a contract with herself, the Angelic Yggdragon Maiden Aura Manifestation Spirit was already evolving into a Divine Beast!
