Nuju needed no more prompting.  He gathered his energies and concentrating on conjuring a storm.  it was incredibly hard, unskilled as he still was in the use of his elemental powers.  But little by little the air began to turn colder, and a chill wind started to blow through the confines of the room.  Moisture in the air condensed into droplets, which then froze into crystals of snow.

Nuju strained to lower the temperature more, and then still more.  Besides him, Whenua shivered, frost forming on his mask.  It was an open question who would succumb to the storm first, the Toa Metru or the creature that had trapped them.

~Greg Farshtey, Trial by Fire, pg 49