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Venice is overrun, as Rome was about to be. Cleanse it! Destroy them all! Put them to the sword!

Mars/Ares about the katoblepones, in The House of Hades

Katobleps (pl. katoblepones), also known as Catoblepas, is a cow monster whose name means 'down-looker'.

The Heroes of Olympus

The House of Hades

The katoblepones were accidentally imported to Venice, Italy from Africa. They eat poisonous roots that grow by the canals and have a poisonous gaze as well as poisonous breath. Frank Zhang destroyed all of them in Venice, which gave him the power of turning his enemy into a snake. He used the power to turn the last katobleps into a snake.

Frank Zhang

Frank Zhang, who destroyed all of the katoblepones.

Monsters
Species: Centaur | Cyclopes | Dragon | Drakon | Empousa | Fire-Breathing Horse | Giants | Gorgon | Harpy | Hyperborean Giant | Ichthyocentaur |

Katobleps | Laistrygonian Giant | Lycanthrope | Merpeople | Nikai | Nymphs | Pegasus | Satyr | Skolopendra | Stymphalian Birds | Telekhine | Blemmyae

Friendly Monsters: Argus | Blackjack | Briares | Chiron | Don | Ella | Festus | Gleeson Hedge | Gray |Grover Underwood | Hippocampus | Mellie | Mrs. O'Leary | Ophiotaurus | Peleus | Scipio | Tyson | Tempest
Enemy Monsters: Agrius and Oreius | Arachne | Basilisk | Charybdis and Scylla | Chimera | Chrysaor | Clazmonian Sow | Colchis Bull | Echidna | Euryale | Geryon | Joe Bob | Kampê | | Nanette | Manticore | Medusa | Minotaur | Nemean Lion | Polyphemus | Sphinx | Stheno | Typhon | Scythian Dracanae
Neutral Monsters: Carnivorous Sheep | Cerberus | Erymanthian Boar | Gray Sisters | Gorgons | Furies | Flesh-Eating Horse | Gryphon | Siren