The rarity of Arms of the Captive Princess is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Arms of the Captive Princess is a skin for Naga Siren. The skin was added to the game on June 20, 2015, it was created by Toasty.
Arms of the Captive Princess has been recently added to the game, which makes it rather popular with the game community.