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- This card is the "lswarm" counterpart of "Gishki Shadow". It's also a counterpart to "Evilswarm O'lantern", being an Aqua while "O'antern" is a Pyro, while having an effect that destroys Spells and Traps, while O'lantern" destroys monsters.
- This card's name is based on ketos, the ancient Greek term for sea monsters.