Not that I have much to add that others haven't (especially since I haven't seen more than the first episode of ATLA and didn't know Korra existed until I read this) but I wanted to say I really enjoyed this piece very much, and am looking very much forward to finding out whatever the Rune Knights, Nall, and Wakaba and Mitsuru were doing. =)

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this world created by the
hands of the gods
everything is false
everything is a LIE
the final days have come
now
let everything be destroyed

--mu