The Fused Shadow (Shadow Crystal) is a quest item from The Legend of Zelda: Twilight Princess. It is the physical manifestation of extremely powerful Shadow magic created by an "ancient race" and once used by a group known only as the Interlopers. This power was sealed away by the Light Spirits.
While the Fused Shadow must be made whole again in order to unleash its full power, its pieces appear to hold a significant amount of power on their own, as they can curse individuals and transform them into monsters.
Powers and Stats
Tier: At least 5-C
Name: Fused Shadow
Origin: The Legend of Zelda
Powers and Abilities: Grants the wearer the immense magical powers of the Dark Interlopers
Attack Potency: At least Moon level (The full power of the Fused Shadow when used by Midna was capable of breaking the barrier erected around Hyrule Castle by Ganondorf wielding the Triforce of Power)
Material: It's basically the physical manifestation of the Dark Interlopers Shadow Magic
Needed Prerequisite for Use: You wear it