Active:Nunu commands his yeti, Willump, to take a bite out of the target enemy minion or monster, dealing them true damage, healing himself and granting himself a bonus depending on which monster he damaged. These different bonuses stack with each other:
Active:Nunuchannels for 3 seconds, slowing all nearby enemies' movement speed by 50% and attack speed by 25% as he does so. Upon completing the channel, he deals magic damage to all enemies in the area, reduced to 12.5 - 87.5% damage if the channel was interrupted, based on how long Nunu channeled.
The reduced damage of the ability scales linearly with channel time . For example, cancelling after 1.5 seconds will deal around 50% of the full damage, cancelling after 0.1 seconds will deal around 12.5%, and cancelling after 2.9 seconds will deal around 87%.
Absolute Zero's area of effect is only visible to enemies if they have vision of Nunu. If he is in the Fog of War or in brush while channeling, enemies will not see the spell animation but they can still be affected by it.