After 5 attacks, Nunu's next spell costs no Mana and is empowered to do its next rank's effects.
Nunu commands the yeti to take a bite out of a target minion or monster, dealing heavy damage to it and healing himself.
Nunu invigorates himself and an allied unit by heating their blood, increasing their Attack Speed, Movement Speed, and Ability Power.
Nunu launches a ball of ice at an enemy unit, dealing damage and temporarily slowing their Movement and Attack Speeds.
Nunu begins to sap the area of heat, slowing all nearby enemies. When Absolute Zero ends, he deals massive damage to all enemies caught in the area.