Lunagaron

When Lunagaron coats itself in ice and stands bipedal, keep striking that coat until it shatters. Seeing as the coat is the target of those blows, continue the assault until the ice breaks apart. Once the coat shatters, Lunagaron is toppled and returns to all fours. Knowing when the monster has taken on that icy, bipedal form is key, for only then will breaking the coat bring it down and restore its four-legged stance.