The Witcher Bestiary - Basilisk
Basilisk Occurrence: Basilisks choose dark and damp places like caves and abandoned canal branches as their dwellings.

Immunity: Immune to most poisons; resistant to stun attempts.

Susceptibility: Sensitive to silver and Ornithosaur Oil.

Tactics: A basilisk's most dangerous weapon is its venom one of the strongest known toxins.

Alchemy: Venom glands.

Simple people call the basilisk the king of the Zerrikanian deserts and often mistake it for a cockatrice. They claim that the beast is filled with such hatred towards all living things that even its breath is venomous and its glance turns the unwary to stone. In fairy tales, the only certain way to kill a basilisk is by holding a mirror in front of its eyes to divert its deadly gaze. Witchers reply that it is far better to smash the mirror on the creature's head.