Lava Eel

The Lava Eels are Rahi that are naturally hot enough to melt pebbles on contact, and they can heat up even more if they are agitated, to the point they can melt through anything when they reach a state of total anxiety. However, Lava Eels are not naturally aggressive, just curious. They start their life cycle being very small and become larger after time.

In Metru Nui, Ta-Matoran sometimes found young ones near the forges and kept them as pets at home. But when the eels eventually became too big and destructive, the Matoran were forced to abandon them. Some lurk around the furnaces, some hide in Reclamation Yards, and some found their ways into the Archives.

A group of Lava Eels was agitated by the Toa Metru's fight with Krahka, subsequently awakening the sleeping Tahtorak underneath the Archives.

Spiked Lava Eels
Spiked Lava Eels are a subspecies of Lava Eels. Their physiology is similar, but the Spiked Lava Eels are covered in barbs used for defense.

Mutations
During their journey to one of Teridax's lairs, the Toa Metru encountered a deceased Lava Eel that had six legs.

Appearances

 * The Mutran Chronicles (Mentioned Only, Used as a Saying)
 * Comic 20: Struggle in the Sky (Mentioned Only)
 * BIONICLE Adventures 3: The Darkness Below
 * Comic 22.5 (Mentioned Only)
 * BIONICLE Legends 5: Inferno (Mentioned Only)
 * BIONICLE: Metru Nui - City of Legends (Mentioned Only)
 * BIONICLE: Rahi Beasts (Mentioned Only)
 * BIONICLE Encyclopedia (Mentioned Only)
 * BIONICLE Encyclopedia: Updated (Mentioned Only)
 * Toa Hordika and the Mask of Light
 * Inika Island Assault (Non-Canonical Appearance)