Skullion

Skullions are large, black dragons which can grow to about ten feet tall. It is a rare species of grounded dragon with no eyes, ears, but a very heightened sense of smell, and a large mouth. Its usual method of killing its prey is using the long claw it has on its pointer-fingers to tear the Achilles' Tendon at the lower extremidies to disable its prey before eating it alive

In The Books
In How to be a Pirate, the Skullions lived on the desolate Isle of the Skullions which was uninhabited except for their species. When the Hooligans embarked on their quest to retrieve Grimbeard the Ghastly's treasure from the island, the Skullions were "sleep-sharpening"(sharpening their claws on rocks while sleeping) in their burrows. Later on, when Fireworm sniffed the treasure and it was dug up by Snotlout, Hiccup warned the Tribe that the treasure would be booby-trapped, but Stoick ignored him and the Hooligans opened the box. Though the Hooligans didn't know it, the box did contain a booby-trap; it was a very strong smell that would awaken the Skullions. The Hooligans did not realize this until it was too late; as they ran for the ship the Skullions bounded out of their burrows and began to chase them. At one point Hiccup was cornered by Skullions and crawled into a hollow log to hide; a Skullion poked its snout into a hole and attempted to get to him. The Skullions were then, however, attacked by Stoick who was wielding the Stormblade. Most of the Skullions on the island were killed after the Hooligans had left the island.

Statistics
Colors: Black and purple.

Armed with: Terrifying teeth, claws ect............9

Radar: Yes, also strong sense of smell..............7

Poison: None.......................................................0

Hunting ability: You don't want to be the prey...9

Speed: Very, very fast.........................................9

Fear and Fight factor: Nasty-unprecedented savagery*............8 or 9