Wan knew of raava because he met her personally. Korra knew of raava because when shit was hitting the fan, she made her presence known to try to help korra avert disaster (and maybe. Hoping to make up for his grievous mistake, wan journeyed with the spirit of raava as he took on the task of learning to manipulate the four primary elements in the. In 171 ag, avatar wan appeared in a vision to an amnesiac korra, who had to reconnect with her deepest avatar memories to find raava. Wan helped her accomplish this by showing her how.
Before the era of raava, vaatu broke. Although raava at first refused, she helped wan master other elements, allowing him to be strong enough to defeat vaatu. When harmonic convergence was upon them, wan used the energy. Raava fused with the spirit of the original avatar (wan). Their souls merged, to became one, so the human soul of wan is now immortal and immutable, but his human body. The very first scene cuts to korra mumbling raava, raava, raava on a stretcher as she is rushed to a very old, wizened fire temple priestess. After a fiery physical. Raava talked openly with wan and, to a lesser extent, korra but not with any other avatars that we know of or know about. Why and at what point did raava go.
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