Denied the chance to post the actual story(for now), I'll have to pass the time with another little character profile.
X, Xandrokil(I don't know how to get the little dots above the "o"), "the Green Death"; real name unknown
Born in a distant solar system, the alien who calls himself "X" in our language was once a proud king. He ruled over a vast kingdom on a world where magic lifeblood ran strong through the planet's veins. X himself was possessed of tremendous physical and psychic power, and his magic prowess was unheard of even in his world.
Though wracked by the occasional destructive wars of its inhabitants, the planet was a lush, idyllic paradise. Under X's long rule, his kingdom flourished and brought great wonders to the world.
Seventy million years ago, an unforeseen eclipse heralded the tragic fate of the planet Alauran. No one knows where the monster came from--it appeared from the depths of space, blotting out the sun. A monster planet, black and twisted and devoid of life... but itself a hideous mockery thereof.
Not even the mightiest magics could harm the monster, which crushed and devoured the entire planet. The king's incredible prowess had caught the monster's attention, and for him it reserved a special fate. The king was bound to its tainted life force, becoming himself a dark inversion of his true body and soul. While his master lived, X would never die.
X called the monster "Shard," for it had truly broken his entire existence into shards. When a planet's Elder spirit--the creator of a world's life--dies along with the physical world, all souls fade into oblivion with that Elder. X had doomed his entire world not just to death, but complete oblivion. As if they never existed.
For eons, X wandered space in the shadow of his master, forced to live with his guilt. When they found a thriving world, immortal X would descend and conquer it. Holy artifacts, mystic rituals, advanced technology... whatever Shard deemed worthy X took from the dead civilizations. Shard's dark magic bound these things as well, providing X with an unfathomable array of weapons and vehicles, knowledge and power.
Five million years since his "rebirth," X was given a doubly-cruel task. Shard's visions had seen far away, to a blue planet to be later called Earth. There lived a beast, the King, his life-force flush and strong. Though X never knew why, Shard wished the distant King destroyed. Even such a monster's dreams were haunted by the eyes of the King.
X saw a vital King ruling over a savage yet beautiful world, not unlike the king he'd once been. He saw a King cut down in the prime of life, just as he had been cut down. But resistance was impossible, and so he sent a massive asteroid summoned through dark ritual hurtling at the Earth.
As the asteroid drew near, its potent energies bolstered the fell spirits of Pangaea. The King lived not to see the impact, because he died in battle against one of the strongest of those spirits. The asteroid impact only jarred their entombed spirits, even as it reshaped the land and wiped out the King's brothers and sisters, and many more.
Content having personally seen the King die, X returned to his master and learned that Shard would travel to Earth. "He" would devour the planet and its Elder spirit, as he had done countless times, gaining in power and hatred for all proper living things.
X is his vanguard, sent to corrupt and weaken, locate the sources of greatest power. The alien takes on many forms, from human to monstrous hybrids of machine and beast. Long life and incredible psychic powers grant him super-human intelligence. Adding to that, X is perhaps the most puissant wizard in the universe. He can lay entire countries low with a single spell.
Though he feels remorse for his actions, X nonetheless carries them out with sadistic glee thanks to his master's influence. He has given up resisting, as he did in the early millennia. Nothing can even harm Shard, let alone destroy it, and without such X's fate is forever sealed. Should he ever encounter a force with the potential to free him, X would do his best to defy his master's wishes.
The rebirth of the King in the twenty-first century is the first spark of such a miracle. From the black sea of stars, X senses the King and returns to Earth to finish an ancient score. He commands an army of mutated and magically-warped alien creatures and deadly machines.
Thus begins the first of their many battles... and all the while, monstrous Shard draws closer to Earth.