This is Ultraman Ribut's Crystal Brace. He wear it on top of his left Arm Crystal. He use this brace for his barrier technique. However, he might still be able to create that barrier technique without this brace as this Crystal Brace might just be an item for amplifying his crystal energy, as seen when he can still made a sphere energy barrier to capture a monster and throw it to space even after losing this brace.
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Ultraman Ribut (ウルトラマンリブット Urutoraman Ributto), also initially incorrectly known as Ultraman...