A feminine figure with cat-like ears and a tail collapsed onto a pile of scraps that used to be battleships and weapons. The biting cold of rusty metal gawned at her body, leaving behind only numbness when they were done.
War had reduced this planet into an apocalyptic tragedy. Eight degrees off its original axis tilt. Erratic gravitational pull. Atmosphere completely stripped away by an enormous UASB meltdown during the war. The only life left here on a sub negative 200 Fahrenheit wasteland was her.
For millions of years, she as an Incubator misdirected and manipulated young females from different planets across the galaxy into signing up as a magical girl and fight Witches in exchange for a wish. Those girls were all the same when they found out the truth behind the Witches. "You tricked us!" they would say, or some variation of it, angry and bitter. And then they got even more angry and bitter when she explained her reasoning for doing so. Their sacrifice was needed for the sake of this Universe that was running out of usable energy.
She mustered whatever strength she had left and dropped the purple gem through a green portal. This gem was a Resonance Gem, its power limited only by the soul wielding it. Their solution to the Universe's energy crisis, as naive as it sounded, was to create something that would never run out of usable energy via their magical girl system. If it wasn't for the Devil, they would have succeeded in doing so by turning that Resonance Gem into an Infinity Gem.
A black mist swirled at a distance. Numbness gave way to the biting cold again. Her last memories of being alive was the smile of Mistress Death mocking her for messing with powers she never completely understood.