Grolem 13

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Grolem 13 is a boss exclusive to Rayman Revolution, located at the end of the Iron Mountains. He is the fourth and last guardian of Polokus's masks in Rayman Revolution. He fires icicles and thundercloulds. Rayman has shoot the thundercloulds to create a giant thunderstorm to damage Grolem 13, in order to get the final mask, the Gold Mask.