The Woden's Nightmare is an unbelievably scary, according to Hiccup Horrendous Haddock III, Sea Dragon. Not much is known about them since they live in the open ocean, and only travel to shallower seas for something important.

Woden's Nightmares sided with Furious and the rebel dragons in the Dragon Rebellion.

Traits and Abilities

As with many Sea Dragons, Woden's Nightmares are huge - only somewhat smaller than a Seadragonus Giganticus Maximus. Despite their size, they are able to swim very fast. Like many dragons, their blood is acidic and have very sharp claws. They can shoot lightening in addition to the more traditional fire. They can also produce dangerous gases, though it is unknown by which route. Woden's Nightmares have an acute sense of smell. They are capable of speaking Dragonese.

One unusual feature is that they can have as many as thirty tongues. Each tongue is capable of perceiving a different taste.


How to Fight a Dragon's Fury: Woden's Nightmares are described as having multiple eyes, that shoot lasers. There are very few multi-eyed dragon species seen in the books, such as Tongue-twisters and Bullguard Slavedragons.

"Woden's Nightmares were many-eyed giants that lived in the dark and wild depths of the Open Ocean and they never came this far into the inland seas. Their eyes shot lasers and they were, as far as Hiccup knew, invincible ..."
How to Fight a Dragon's Fury

Another ability of Woden's Nightmares is revealed in How to Fight a Dragon's Fury. They can spew out a black substance that coats the surface of water, which is also flammable, sounding very much like an oil slick.

"The dreadful bulk of the multi-eyed Woden's Nightmares, nearly as huge as the dragon Furious himself, lighting up the sky with their eye beams, and pouring out a strange, black substance across the waters, which they then set fire to, so that the whole of Wrecker's Bay turned into a sea of flame."
How to Fight a Dragon's Fury



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