re: The Legend of Korra Book 3 Premireres Next Week

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C) rava can be destroyed and come back but vatu can't? The avatar continues on after death but not the dark avatar. Inconsistencies.

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Vaatu will eventually return, but he was killed in the Avatar State. Unalaq's merger won't return, but within the next 10,000 years, Vaatu will emerge out of an Avatar. It's heavily implied that both Vaatu and Raava have killed each other countless times through the eons, just to rise from the other.

It will be thousands of years before Vaatu rises again though, to where Korra doesn't really need to worry about it.