| Mirror Mirror in my hand,|
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Ursula's necklace is a magical item owned by said Sea Witch and it seems like it only works for those related to her by blood. Uma wears the gold nautilus shell around her neck via a golden chain
- enabling shape-shifting
- storing other's voices
- hypnosis/controlling others
It once held Ariel's angelic singing voice.
In Descendants 2, Uma uses it to grow tentacles to look as threatening as her mother.
In Under the Sea, the necklace played a major role. It was first seen glowing around Dizzy's neck, and it allowed Uma to talk to Mal through controlling Dizzy, Harry and Gil