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The 'X' Dragon is only mentioned in The Incomplete Book of Dragons.

Physical Appearance

The Author, Cressida Cowell, named this dragon and illustrated its egg, which is grayish with a distinct white 'X' mark on it. She did not divulge any further information about this dragon.

Appearances

The Incomplete Book of Dragons

Only the egg of the 'X' Dragon appears, in the chapter about dragon eggs. It is mentioned no where else.

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