Hirogari Goshujin Kurohane, Sephiroth!
That was the chant that one Uzumaki Naruto utters. In full translation, Naruto commanded the sword to "Spread Your Black Wing." The sudden rush of power fills the young adult. His clothes ruffle under the invisible wind, as the sword's strength reveals itself to all. Even Madara stepped back as the sword began to change. From what was once a simple seven foot long blade known as the Masamune, the once dulled metal suddenly gained a gleaming polished look, the dull metal color turning to a full silver tint. The guard of the blade grew a small black wing on the right side.
The entire sword pulsed with an aura unlike anything no human has felt. His once blue eyes, now become cat-like, and shift to a glowing greenish blue tint. His clothes are engulfed in an aura of white, which dissipate seconds after, granting Naruto a wardrobe that consisted of a long leather trench coat, pauldrons on the shoulders, and tight leather pants with armored black boots, armored forearm pads. And then feathers formed, before a shower explodes from Naruto's right shoulder blade, forming a large black angel wing. Even his hitai-ate was burned away, allowing the metal plate to collapse to the ground freeing his spiky hair.
The aura slowly dies away, as Naruto now stands there, transformed. "What do you think of my power, Uchiha?" whispers Naruto in a deadly voice.
With a flick of the sword, a large wave of crescent energy was launched from the still seven-foot long Masamune. Madara barely escaped the attack. But before he can counter, Naruto had suddenly moved at him with yet another swing of the sword. Again, Madara narrowly escaped, but the sword can carved a deep groove into the earth, shocking the survivors of Konoha, and their allies. Each swing of the sword, more trenches is formed, and half a forest has been sawed down by the waves of energy Naruto was simply releasing.
But then Naruto finally struck down Madara, as the man fell to the ground, his mask split in half a sword cut down his face. Blood seeped from the wound, as Naruto shot down like a meteorite. An explosion ensues. Madara was torn up from the explosion, and his robes and cloak was shredded, down to the armored clothes he wore under it. But even they were showing signs of damage, as multiple cuts, wounds, and heavy injuries show itself on the feared "immortal" Uchiha.
"What the fuck are you?" Madara muttered in fear. A fear gripped him, working its way into his heart. He was pegged invincible and untouchable by even the greatest of ninjas, and yet... this boy was making him feel that one emotion that weakens the greatest of man and woman alike.
"Death incarnate," he says, and he swings his sword at Madara's neck. "And then there was one... Obito..."
The supposed-to-be-dead-ninja (turned evil and psycho) tries to flee for his pathetic selfish life...
Bad idea.