When Makuta Arzos(see Arzos), began experimenting on water and ice Rahi, he decided to create a Rahi capable of controlling elemental water and ice power. The result was Frostrak, a giant, vicious Rahi. Frostrak has ice breath, a stinger tail, sharp claws and teeth and the ability to shoot blasts of water. After the first Frostrak was made, Makuta Arzos began making more of them. The Frostrak are primarily used to conquer lands and destroy fortresses by Arzos and Teridax. Arzos also unleashed a few Frostraks on Metru Nui. Now, most Frostrak lurk in the waters of Ga-Metru or the streets of Ko-Metru.