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He could feel it.
It was barely noticeable at first; but it was most certainly there. A small tingle rang across his flesh, sending a tiny shudder over his body. Threads of green reached out to kiss the bare skin upon his hands; so gentle, so pleasant. But how it made him tremble with power.
This was the end.
The others watched him, bug-eyed and mouths agape. The stench of their terror was overwhelmingly enticing, emanating as a flood from their delicate bodies. This was not how it was supposed to be; but alas, they were too late. Meteor loomed above the city, the orange sky above burning with the very same violent anger that he had held inside himself for so, so long.
He could feel it change him.
From deep within his aching form, he could feel his innards shifting. His flesh rippling, expanding, pulsing. From the tips of his quivering fingers, brittle nails pushed past soft skin; huge black talons of death forming. And on his spine which so pressed itself against his back, pale bone slicked past tissue, small rivulets of blood trickling down the new row of sharp prongs that had appeared upon his dorsal. He was growing larger and larger, arms and legs and torso cracking as they swelled with pure power. Next to the line of bones piercing through his spine, a mass of flesh tore through muscle; red and throbbing, followed by more appearing around his waist and legs and arms. Ever so gradually, they formed into tattered wings.
Sephiroth watched on as every living being around began to run from him, so small and insignificant. The only ones who remained were his foes, but… they would all share the same fate as the very people they were trying to protect. Their ‘bravery’ would ultimately be meaningless. Soon, everyone would join the planet… and the planet shall join with him.
He felt flesh peel open as fresh new eyes began to peer from his legs, his torso, his wings, his face. In absolute silence, he floated up into the air, feeding upon more and more of the succulent viridescence of the lifestream. There was a pain afflicting every inch of his body; it fluctuated and throbbed with a level of power he had never felt beforehand. Oh, and how wonderful it felt, for this agony that tore across bone and muscle was a loud proclamation of the new-found strength that flowed through his being.
More spines shot through flesh, skin hardened and strengthened into unpiercable armour; he could feel his face lengthen, teeth extending into knives, bones shattering and changing in their very structure.
Now… he was utterly unrecognisable.
Those below him stared helplessly with tears in their orbs, oh so frightened by the God so forming before their very eyes, appearing as though merely looking upon him was beginning to tear their little minds to shreds. Ah, but there was no need to be afraid. For soon, all the fear in the world- all the pain, the suffering, the cruelty- it would be erased in a matter of moments.
Tendrils sprouted out amongst his wings, snapping into the grounds below and waving around as they sucked up more of the precious lifestream. Huge halos tore themselves into existence with a thrum, spinning around him rapidly. Red veins pulsed across his form, in tandem with his heartbeat that reverberated so slowly within his chest, while crimson dripped from various openings slit across his body. Finally…
… the world was his.