The Sea Whip's Fetter is an amplifier that consists of the seven golden scales of Rusalye.

History

Siege and Storm

At The Darkling's behest, Mal tracks down the Sea Whip. After a violet exchange with the Darkling and his guards, Alina kills Rusalye with a single blow and cuts seven scales from the beast to harness as an cuff-like amplifier that circles her wrist.

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