The Legacy of Yangchen is the latest book in the Chronicles of the Avatar series, and the last of the Yangchen duology. In the aftermath of the events of The Dawn of Yangchen, the airbending Avatar finds herself in the difficult position of having to de-escalate conflicts between heads of states of the Four Nations, in the midst of the threat of a powerful new weapon. To makes things even more difficult for her, she must turn to assistance from Kavik, whom she’s not on good terms, following an act of betrayal by the latter from their previous adventure together.