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Chthonius is one of the six Greatwyms from Dragalia Lost.
He is a silver quadrupedal dragon with glowing green eyes.
Like with Zodiark, he is a dragon of the shadow element.
Long ago he and the other Greatwyrms aided King Alberius in stopping Morsayati, but their power alone could not stop him, prompting Alberius to dragonshift with Chthonius to seal him away for several hundred years.
This however proved to be a painful experience and when Prince Euden arrived, he had to put his ancestor out of his misery.
While Chthonius does survive, he does not join the party immediately.