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Devourers of the Abyss are large fish with a large square head with a mouth filled with long sharp teeth. They have a pair of large fins and a long thin tail. There are large spikes on their body, glowing green eyes and a fin ending that look like a small green glowing bulb on the top of their heads which is their only weak spot.
In The Devourer, when a Devourer of the Abyss tried to attack the Trix, their powers could not stop it and it almost ate Icy but Tritannus saved her by using his toxic powers to take control of it and send it to eat all the Selkies in the Infinite Ocean.
Daphne appeared to Bloom in a vision and warned her. However Bloom, Stella, and Aisha were at the Sovereigns' Council meeting on Domino and could not leave and Bloom then warned Tecna, Flora, and Musa who were at Alfea and they were able to stop the Devourer by using their powers on its weak spot to free it from the control of Tritannus.
In "The Mystery of the Abyss", it only makes one minor appearance in the beginning part of the movie.
- The appearance of the Devourer is a mix of several marine animals: