One of the most fascinating and well written crossover fanfics I've had the pleasure of reading. The story is somewhat of a sequel to The Legend of Aang and the Legend of Korra. Avatar of Victory perfectly blends two different fictional universes in such a well written way, that its easy to imagine that Avatar of Victory IS the future of the Avatar universe. The characterizations are perfect and the story is good. One of the best parts about reading this fic is seeing bending from the Avatar universe in the Mass Effect world. Shepard, who is the Avatar in this story, is perfectly shown to have flaws that over time she comes to overcome and be a better Avatar.
If you are a fan of Avatar The Last Airbender and Mass Effect, then I'd easily give this fanfic a read. I'll be worth it.