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The Woden's Nightmare is a large Sea Dragon first mentioned in The Incomplete Book of Dragons.

Physical Appearance

Not much is known about Woden's Nightmares since they live in the open ocean, and only travel to shallower seas for something important. As with many Sea Dragons, Woden's Nightmares are huge - only somewhat smaller than a Seadragonus Giganticus Maximus. One unusual feature is that they can have as many as thirty tongues. Each tongue is capable of perceiving a different taste. Most images of the Woden's Nightmares also show a jumbled collection of multiple eyes.


Despite their size, Woden's Nightmares are able to swim very fast. Like many dragons, their blood is acidic and have very sharp claws. They can shoot lightning in addition to the more traditional fire. They can also produce toxic gases, though it is unknown by which route. Woden's Nightmares have an acute sense of smell. They are capable of speaking Dragonese.

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  


How to Fight a Dragon's Fury

Woden's Nightmares appear to fight against the humans during the Dragon Rebellion.

The Incomplete Book of Dragons

Woden's Nightmares are detailed in this reference book.


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