Talk:Guardian Dragon/@comment-13890295-20140822013508/@comment-4511886-20150218070617

Using lightning is one of, if not the, only ways to break the stone scales of the Everlasting Dragons. All dragons are descendants of the Everlasting Dragons, and thus inherited the scales to some degree, indirectly giving them a weakness to lightning as well.

Seath, who has no scales, is just as weak to lightning as he is to fire, which more or less confirms this, as he is also the only dragon in the game with this quality.