"The Sivvimyr emerged into our universe through a quantum breach; another universe where physics and logic are unfamiliar to how we would understand it. They came to our plane in search of essential materials, energies and universal fibers that their reality lacked; elements which provoked life to allow itself to be. They had come to harvest from us the essence of life itself.
"In their invasion, their emerged three factions of aggressors. First were those who saw no way forward but to combine their metallic anatomy with our organic nature, to create something new and superior. Second were those who saw us as naught but a resource, from which could be drawn the vital elements to perserve them. Last were those who embraced the oblivion that had consumed their reality; to them, void was the rightful destination of all existence, and it was their duty to ensure that all worlds embraced such an end..."

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A re-post from my other account, of an old illustration that I rather like still in spite of its age.