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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

Frank Zhang, who destroyed all of the katoblepones in Venice.

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.

Description

Katobleps had the large body of a buffalo, which sat atop squat legs that resembled those of a pachyderm. A katobleps' head resembled that of a warthog, and sat atop an elongated neck that seemed ill-suited for actual support. Perhaps the most terrifying feature of these beasts were their large and deadly bloodshot eyes.

Katobleps possessed a scent that reeked of death and famine, not dissimilar to the swamp gas that filled their favored environment. The scent was reminiscent of skunk's stench mixed with foul bog vapors.

The Heroes of Olympus
Core Series: The Lost Hero | The Son of Neptune | The Mark of Athena | The House of Hades | The Blood of Olympus
Main Characters: Jason Grace | Piper McLean | Leo Valdez | Percy Jackson | Frank Zhang | Hazel Levesque | Annabeth Chase | Reyna Ramírez-Arellano | Nico di Angelo | Gleeson Hedge
Secondary Characters: Hylla Ramírez-Arellano | Dakota | Tyson | Ella | Octavian | Halcyon Green | Dr. Howard Claymore | Alabaster C. Torrington | Lamia | Iapetus/Bob
Minor Characters: Rachel Elizabeth Dare | Grover Underwood | Thalia Grace | Fleecy | Mrs. O'Leary | Kinzie | Arion | Calypso | Lou Ellen Blackstone | Chiron | Will Solace | Tristan McLean | Don | Julia | Jacob | Michael Varus | Burly Black | Medea | Midas | Lityerses | Phineas | Otrera | Echo | Narcissus | Sciron | Pasiphaë
Olympian Gods: Zeus | Hera | Poseidon | Hades | Ares | Demeter | Athena | Apollo | Artemis | Hephaestus | Aphrodite | Hermes | Dionysus
Minor Gods: Achelous | Aeolus | Asclepius | Boreas | Eurus | Hecate | Iris | Hypnos | Keto | Khione | Kymopoleia | Mithras | Nemesis | Nike | Notus | Phorcys | Serapis | Thanatos | Triptolemus | Zephyros
Roman Gods: Jupiter | Juno | Neptune | Pluto | Mars | Minerva | Ceres | Lupa | Bellona | Fortuna | Janus | Terminus | Vulcan | Mercury | Apollo (Roman) | Diana | Venus | Bacchus | Pomona | Aquilon | Hercules | Cupid | Auster | Favonius | Letus | Victoria
Giants: Enceladus | Porphyrion | Alcyoneus | Polybotes | Ephialtes | Otis | Damasen | Clytius | Mimas | Orion | Hippolytos | Thoon | Periboia
Undead: Gray | Zombie
Primordial Gods: Gaea | Tartarus | Ourae | Nyx | Chaos | Ouranos | Akhlys | Hemera | Elpis | Spes
Monsters and Magical Creatures: Cynocephali | Gorgon | Gryphon | Harpy | Basilisk | Lycanthrope | Gegeines | Cyclops | Katobleps | Unicorn | Giant Eagle | Ichthyocentaur | Satyr/Faun | Storm Spirit | Laistrygonian Giant | Lares
Related Content: Rick Riordan | Haley Riordan | Percy Jackson and the Olympians | Percy Jackson and the Olympians: The Ultimate Guide | The Demigod Files | The Demigod Diaries | The Son of Sobek | The Singer of Apollo | The Staff of Serapis | Percy Jackson's Greek Gods | Percy Jackson's Greek Heroes | The Crown of Ptolemy | Demigods & Magicians | Demigods of Olympus | Percy Jackson Demigod Collection
Monsters
Species: Amphisbaena | Apollo's Cattle | Blemmyae | Basilisk | Carnivorous Sheep | Centaur | Cyclops | Cynocephali | Dragon | Drakon | Empousa | Eurynomos | Feather-Shooting Bird | Fire-Breathing Horse | Flesh-Eating Horse | Gegeines | Geminus | Giant Eagle | Giant Scorpion | Giant Snake | Ghoul | Gorgon | Gryphon | Harpy | Hellhound | Hippalektryon | Hippocampus | Hydra | Hyperborean Giant | Ichthyocentaur | Karpoi | Katobleps | Keres | Khromandae | Laistrygonian Giant | Leucrotae | Lycanthrope | Makhai | Merperson | Myrmekes | Nikai | Pandai | Pegasus | Pit Scorpion | Satyr | Scythian Dracaena | Sea Serpent | Siren | Strix | Stymphalian Birds | Tauri Sylvestres | Telekhine | Troglodyte | Unicorn | Vrykolakai | Yale
Friendly Monsters: Argus | Blackjack | Briares | Bombilo | Chiron | Cottus | Don | Ella | Festus | Gleeson Hedge | Gray | Grover Underwood | Guido | Gyges | Lysas | Mrs. O'Leary | Ophiotaurus | Peaches | Peleus | Porkpie | Rainbow | Scipio | Tyson | Tempest | Sssssarah
Enemy Monsters: Antaeus | Agrius and Oreius | Arachne | Cacus | Carthaginian Serpent | Charybdis and Scylla | Chimera | Chrysaor | Clazmonian Sow | Colchis Bulls | Echidna | Euryale | Geryon | Kampê | Karkinos | Kekrops | Lamia | Manticore | Medusa | Minotaur | Nemean Lion | Polyphemus | Python | Skolopendra | Sphinx | Stheno | Sun Dragons | Typhon | Trojan Sea Monster
Neutral Monsters: Cerberus | Erymanthian Boar | Gray Sisters | Furies | Ladon | Orthus | Sybaris
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