Cursed Shackle is Midna's Level 1 Shackle from Hyrule Warriors and Hyrule Warriors Legends. Midna wears it as a Hair tie in both her Imp (which also doubles as a bracelet for her hand-like hair) and Twili forms. Befitting Midna's origins, it has a Darkness Elemental Attribute.
Twili Midna wearing the Cursed Shackle in her victory cutscene from Hyrule Warriors
The Cursed Shackle is based on Midna's Hair tie from The Legend of Zelda: Twilight Princess.