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He slumbered in darkness. The only thing he heard from his dreams were the voices of those foolish humans. Of how their nation would conquer the others with his help due to the "deal" he and that foolish old Fire Lord made as he slumbered within the lava. He provided those mortals unique metals of the earth by his will in order to make his armor so he may deal the finishing blow to the one city that they are constantly infuriated with. Heh, humans are so greedy and selfish that they'd probably leave a 2 year old child to die out on the streets if hit by a cart with no concerns at all.
…That's what sickens him. Even though he was a High-Class Hell Dragon, even he, the wickedest of monsters and his own kind, were disgusted at these humans and their own cruelty. Even hatchlings help each other out from brutal incidents in their time. Something that proves that they deserve a right to exist; however, these humans are beyond redemption. He has already "merged" with this version of the planet, so the Hour of Twilight will commence in this world soon enough when the time comes. He recalled how he was separated from his original soul, broken into a mere fragment, struggling to survive until he was found.
His power helped make the Fire Lord and his armies grow powerful, but now, sensing all the evils in this world…He will become All the World's Evil once again and destroy humanity for its sins as it has done so many cycles ago. The forging of his armor was today, his plan to punish mankind as a whole is about to commence. And the first to feel his wrath is the very land he slumbers within…the Fire Nation itself. Moving in the lava it slept in, the men beginning to set his armor to help suppress his destructive powers. The metals were glowing hotly as the creature began its speech.
"Pain…" the deep, sinister voice rumbled quietly.
A hammer strikes heavily at the searing molten metal…
"Agony…" it continued as it growled in anger, not at the people forging his armor, but at humanity itself, for the world is calling him, to ask of him to cleanse this world of these foolish humans that have stained it red with blood from these many years of war.
The hammers continued striking the metal as the shadow of the creature continued growling, both in pain and agony. "My hatred burns through the cavernous deeps…" it uttered. That was when the hot metal plating, lifted by chains, was latched onto a patch of molten, gapping flesh, the searing hot metal burning as the creature roared in pain.
Hammers rang away against the giant armor as the being wearing it twitched violently, as earthquakes above in Omashu appeared. A giant ram slammed a bolt into place in a piece of armor in as a giant, scorched wing, flexed itself, as above in the surface; a giant tsunami overshadows the Fire Nation.
Another giant ram slams another bolt into the spine of the beings armor as it roared in pain, slamming itself against a wall as fissures tore the North Pole apart.
"The world heaves with my torment." It continued, as the chaos above in the world was continuing. "Its wretched kingdoms quake beneath my rage... "The creature continued as the smaller islands of the Fire Nation and Kyushu Islands were all swallowed by the rising waves. More metal rams slammed in the last of the bolts into the armor and the creature's flesh, as from the lava, a giant claw swipes the rams and the people away, as sinister red eyes with three tomoe spinning sinisterly as the creature cloaked in darkness growled as it unleashed a roar as it ripped through the surface and took flight, leaving smoke and flames in its wake.
The creature roared creating a shockwave near a port as people fled in fear as it flew past them, as everything was engulfed in flames.
"But at last... The whole of the four nations will break..."
The Air Nomads screamed in horror as they and the sky bison were all engulfed in flames. The creature continued on, its destination made clear.
"...And all will burn beneath the shadow of my wings... "
The creature landed on the palace of Ba Sing Se as the creature's true form was revealed. A sinister dragon donned in armor with molten rivulets of lava and magma visible beneath the great wyrm's scorched scales as its cruel eyes shine with malevolence as it unleashed an earthshattering roar as it began its rampage, as the great walls of the great Earth Kingdom came tumbling down.
Avatar: Cataclysm