Seishitsu

Nobukatsu is a straight katana forged and used during the Hyakuen Wars by Kanematsu Oda, founder of the Oda Clan and the first emperor of what would become a unified Fuso.

History
Nobukatsu was first forged by Kanematsu Oda ten years after the onset of the Hyakuen Wars. Upset by all the battle and bloodshed that was going on, Kanematsu put his heart and soul into making an indestructible blade. Once the blade was finished, he used ancient Fuso magic to instill it with the powers of the elements.

Armed with the blade, Kanematsu demonstrated its power to the locals and rallied them to form an army to unite Fuso under one banner. With the Sword in Hand and his followers behind him, Kanematsu united his home island and founded the Fuso Empire, and over the following years united the rival clans through diplomacy and conquest.

Fifty years after beginning his campaign, Kanematsu passed away and Nobukatsu passed onto his son Akishige Oda, who proceeded to finish his father's work in uniting Fuso, but only managed to get halfway through the second most southern island before dying of disease five years later, then passing the sword to his brother Chikayoshi. Chikayoshi then spent the next thirty-five years finishing the work of his father and brother before finally claiming victory. However five more years of rebellion against Oda rule ensued before peace became a reality.

Shortly before his death, Chikayoshi placed a charm on Nobukatsu's sheath to prevent it from being drawn again until only the one most worthy gained it's possession. Nobukatsu was then placed deep in what would become the Imperial Mausoleum, the final resting place of all Fuso Emperors.

One thousand Years later, the Nobukatsu came into the Possession of Kanematsu's descendant, First Princess Suguha Oda, Lunaoculus of Aquilonis.

Powers & Abilities
Nobukatsu's Powers revolve around the elements, Wind, Water, Earth, and Fire, hence it can only be wielded properly in the hands of a Bender. However, unlike benders, it can only use one element at a time. The blade changes color depending on the element in use, with it only retaining it's original color when using wind.