The Basilisk had a classification as an XXXXX creature, meaning it was a known wizard-killer that couldn't be domesticated due to its immense powers. It was also the mortal enemy of spiders, who could intuitively sense them and flee whenever they did. Looking a Basilisk directly in the eye caused instant death, but an indirect look would merely render the victim Petrified. The practice could be hidden when the Department for Regulation and Control of Magical Creatures came to check by simply removing the egg from the toad.

Basilisk breeding was banned in Medieval times. Herpo the Foul was the first to breed a Basilisk he accomplished this by hatching a chicken egg beneath a toad which resulted in the creature known as a Basilisk. It was a magical beast that was bred usually by Dark Wizards. The Basilisk was a giant serpent, also known as the King of Serpents.

Spiders flee before the Basilisk, for it is their mortal enemy, and the Basilisk flees only from the crowing of the rooster, which is fatal to it.' - Most Macabre Monstrosities Its methods of killing are most wondrous, for aside from its deadly and venomous fangs, the Basilisk has a murderous stare, and all who are fixed with the beam of its eye shall suffer instant death. This snake, which may reach gigantic size, and live many hundreds of years, is born from a chicken's egg, hatched beneath a toad. ' Of the many fearsome beasts and monsters that roam our land, there is none more curious or more deadly than the Basilisk, known also as the King of Serpents.

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