Keahilani

Keahilani is the Lava Warlord and militaristic leader of the Lava Realm. Due to his Warlord status, he is considered one of the world's undoubtedly most powerful benders, completely mastering the usage of the lava sub-element. Mortal enemies with the Sun Warlord, Atezuma, Keahilani always strove to defeat his adversary and counterpart in a duel, as well as finally assure Lava Realm superiority over the Sun Realm as his ancestors never could.

History
After the death of the Lava Realm's Warlord, and the brutal fall of Marshal Halaui in an engagement between Cenote and Manalui, an up and coming Keahilani participated in a tournament for succession, and ultimately defeated all of his former comrades in a barbaric war that ended in Keahilani moving up to claim the crown with his impressive power. For years prior, the Sun Realm was significantly wealthier, and dominated the Lava Realm, until Keahilani ascended to power. The two rival nations were evened out in strength.

Riverlands Rebellion (592 AG)
All five Realms remained neutral in the massively expanding, global-scale war that was erupting in the Old World, for the beginning days of the long ordeal. Warlord Keahilani was not actively involved, until the Avatar himself approached him in Manalui and presented negotiations, in exchange for the allegiance of the three Realms: Storm, Spirit, and Lava. Keahilani agreed to the terms presented, allowing him and his allies equal representation in the Union Council and WIP

Siege of Crystal Abyss
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Keahilani's Campaign
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The Four Blades versus Keahilani
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Battle of the New World
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Battle of Haishan

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Second Battle of Carcosa
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Retaking Ba Sing Se
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The Summer Offensive
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Battle of Heliseum
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Trivia

 * The Hawaiian name "Keahilani" means "heavenly fire".
 * He has been canonically stated as one of two strongest Warlords, just a hair away from Atezuma.