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Druddigon is a large, blue, draconic Pokémon with medium-sized wings shaped like thistle leaves. Its bright red head is harder than rock and is very rough. It has a set of glaring, ferocious pale yellow irises. Its arms are longer than its legs, giving it the appearance of a hunchback. It has a thick, moderately-sized tail and sharp claws on both the hands and feet. It also has tall, conical, red spikes; three on each arm, one on each shoulder, two on each leg, and four on its tail. It has a blunt, brutal snout, bearing a maw with no discernible teeth; instead, small fang-like protrusions sprout from its jaws. It has a series of olive, ellipsoid scutes running across its belly.
Druddigon warms its body by taking in sunlight with its wings; if its body temperature lowers, it becomes immobile. It has savage physical strength; it nimbly chases prey around its den, using its outstretched claws to catch them. Druddigon lives in caves, and is carnivorous.