Fenrakk

Fenrakk are a kind of spider with acidic saliva. The most well-known Fenrakk was enlarged by the Mask of Life and forcibly fused to Vezon, as a way of cursing Vezon. 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 makes the two unaffected by all physical blows (as they immediately grow strong enough to withstand the attack), and the mask also grants them protection from other dangers such as lava.

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