Avatar: The Forgotten Flame

Between Avatar Kuruk and Roku, there was another. A Fire Nation Avatar who defied her own people, fell in love with an Air Nomad, and stood against an empire's first sparks of conquest.

Her name was Osyra.

With her soulbound lionhound Rhazor and the spirit-bird Solari, she fought to stop the Fire Nation's march across the world. But when her enemies turned to dark spirits, opening a rift that threatened both realms, Osyra faced a choice no Avatar should bear: unleash destruction, or sacrifice herself to close the tear.

To save the world, Osyra gave her flame, her soul, and her name.

Erased from history, forgotten by mortals, she remained only as a whisper in the cycle - until Aang.