The world of the Avatar is bigger than we imagined. Aang has discovered Terra Incognita, two previously undiscovered nations on the other side of the globe. Learning the ways of the Wood Clans and the Metal Empire may be Aang's only hope of averting a calamity to both worlds. (A canon edit of the events following ATLA. The comics, novels, and LoK are not canon).

Frustrated with the lack of published knowledge on magical glyphs, Luz seeks a primary source. Legends tell of a powerful wizard who once wielded these glyphs as a magical knight. They say he is kept in a magical slumber in a cavern deep beneath Dirk Falls, awaiting a champion brave enough to rouse him from his age-long sleep...or in this case, to slap him clean across the face...

After a century of war, the four nations now enjoy a new era of peace and prosperity. But all is not well as several convoys of exploratory vessels go missing. In their investigations, Team Avatar stumbles upon a strange new world...enter the Metal Empire (based on Ancient Rome/Imperial Britain)...the Wood Clans (Ancient Celtic/Medieval Scottish)...and the mysterious Arbiter.