Magmilus

It jets through the deep lava-tubes and even swims the molten pools themselves, its lava-arms coiling and streaming behind it, and it moves with a quickness that its bulk has no right to. It hunts by flooding a cavern with superheated arms, and few things trapped in that glowing tangle escape. It is territorial over the richest, hottest vents, and rival Magmilus duel in slow, spectacular tangles of molten limbs deep beneath the mountain, contests that light the caverns red for hours and reshape the very rock where they grapple.