Seiya - Dragon Size Reference

Her transformation isn’t gradual but instantaneous. The lizard body for which she’d been ridiculed has mutated into a colossal dragon with ocher scales. I’m guessing her body spans roughly ten meters in length with her long, thick tail included. The Great Mother spreads her massive wings and lifts her head into the  air,  exposing  her  ferocious  face.  Then  she  opens  her  mouth,  baring  her knifelike fangs, and roars.

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“Grah-ha-ha-ha! It must have never crossed your mind that you would end up fighting a dragon while you were here. The scales of a dragon are stronger than any metal! An ordinary sword won’t even leave a scratch! Hero, do you know what this means? You cannot defeat me!”

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Volume 1, Chapter 26