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However, before they can actually craft it, they'll need to get their hands on a piece of Gelatinous Mass, which they'll get from beating the Flan Prince Notorious Mark.
Source: https://gamerant.com/ff16-xvi-final-fantasy-16-how-to-get-all-vambraces-for-clive-materials-upgrade/
Players hoping to track down Gelatinous Mass are going to need to take on the hunt for the Flan Prince, found west of Amber at Hawk's Cry Cliff in Rosaria.