Fenrakk

The Fenrakk were a kind of spider with acidic saliva. The most well-known Fenrakk was enlarged by the Mask of Life and forcibly fused to Vezon in order for Vezon to better guard the mask. The Mask of Life also gave both Vezon and this Fenrakk the ability to absorb kinetic energy, allowing them to grow stronger with every physical attack made by them or against them. This ability made the two unaffected by all physical blows (as they immediately grow strong enough to withstand the attack), and the mask also granted them protection from other dangers such as lava.

After falling into lava during their fight with the Toa Inika, Vezon and Fenrakk emerged once again, except Fenrakk emerged as a different creature: the Kardas Dragon. The history of Vezon's Fenrakk continues in the linked article.

The Toa Inika tamed smaller (possibly normal-sized) Fenrakk Spawn Spiders to use as mounts in their sieges against the Piraka Stronghold.