Vaatu manipulates Sozin into instigating the 100-year war and talks Iroh's mother, Ilah, into helping Vaatu get free, and Vaatu is reborn as a human named Ozai through Ilah. Harmonic Convergence arrives in the finale of ATLA Book 4: Air. The Fire Lord before Zuko instigates the 100-year war and rules until the end of the war's 100th/final year and is in peak condition despite how old he'd be. Iroh is Ursa's brother, Zuko and Azula are still born in their canon days, and the comet arrives in the finale of ATLA Book 4: Air.
