Balorian Spider

Balorian Spiders are massive arachnids that inhabit the Caves of Balor.

History
Arthur encountered these spiders during his quest to retrieve a Mortaeus flower from the Caves of Balor. After Nimueh betrayed Arthur and left him for dead, he killed one spider with his sword and was nearly attacked by a swarm of hundreds. However, he followed Merlin's guiding light to safety before the spiders reached him (The Poisoned Chalice).

Abilities
Balorian spiders appeared to be very sensitive to sounds and could climb relatively fast. They were known to be capable of killing a human, as Nimueh was certain that they would be able to kill Arthur (The Poisoned Chalice).

Trivia

 * Though capable of killing humans, their exact method of doing so is unknown (The Poisoned Chalice).
 * Balorian spiders appear to prefer dry, dark places to live and hate daylight, as they did not follow Arthur after he left the caves (The Poisoned Chalice).

Gallery
Araignée balorienne