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"With Vikings on the backs of dragons, the world just got a whole lot bigger."
Hiccup Horrendous Haddock[src]

This article is a stub and would benefit greatly with more information. You can help by expanding it.

Killer is the hunting dragon of Thuggory, who only appears in the first book, and is the only silver Monstrous Nightmare. Not much is known about Killer.

It doesn't have a good reputation ever since it broke into battle with Fireworm (Snotlout's Monstrous Nightmare).

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