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dark orb (madoka magica)
An item from the third Mahou Shoujo Madoka Magica movie.
Note: Major Spoiler Warning!
The Dark Orb is the Soul Gem of Homura after it gets corrupted with love rather than grief (which would result in a Grief Seed). It takes the form of a black crown and shines in impossible colours. It enables her to transform into Akuma Homura, the demon to Ultimate Madoka's angel.
Examples
