The damage type that Nunu & Willump deals is mostly True Damage.
Nunu & Willump's damage type breakdowns as follows:
Dealing damage to enemy champions, large monsters, or structures grants Willump and his ally nearby with the highest attack speed Call of the Freljord, increasing their attack speed by 20% and movement speed by 10% for 4 seconds.While Nunu & Willump are under the effects of Call of the Freljord, their basic attacks cleave for 30% bonus Attack Damage damage.The duration stacks but the effect can only occur once every 10 seconds per target.
Willump takes a bite of an enemy, dealing damage and healing himself. This healing increases by 50% of maximum Health when he is below 50% health.Monsters and minions: Deals 400/600/800/1000/1200 true damage and heals for 65/95/125/155/185 (+90% bonus Ability Power) (+10% of bonus Health).Champions: Deals 60/100/140/180/220 (+10% of bonus Health) magic damage and heals for 39/57/75/93/111 (+90% bonus Ability Power) (+6% of bonus Health).
Willump rolls a snowball that grows in size and speed. The larger the snowball, the more damage it deals and the longer it knocks up.When the snowball impacts a wall, enemy champion, or large monster, it explodes, dealing up to 180/225/270/315/360 (+150% bonus Ability Power) damage to nearby enemies and knocking them up.Reactivating the ability rolls the snowball forward on a straight path.Continuously turning in the same direction increases Willump's turn rate over time. This bonus starts over when changing turn direction.
For 3 seconds, each additional cast causes Nunu to throw 3 snowballs at a rapid rate. Enemies hit take 16/24/32/40/48 (+10% bonus Ability Power) magic damage, and champions and large monsters become Snowbound. Enemies hit 3 times are slowed by 30/35/40/45/50% for 1 second.Willump's Turn: After Nunu is finished throwing snowballs, all enemies within range that are Snowbound take 20/30/40/50/60 (+80% bonus Ability Power) magic damage and become rooted in place for 0.5 - 1.5 (based on level) seconds.Nunu can cast Snowball Barrage up to 3 times before Willump's Turn.Nunu can only slow each enemy once with Snowball Barrage.
Willump channels for 3 seconds, sapping the area of heat. Nearby enemies have their Movement Speed slowed by 50%, increasing to 95% over the duration of the channel. Nunu and Willump receive a shield that absorbs 65/75/85 (+30/40/50% of bonus Health) (+150% bonus Ability Power) damage, decaying over 3 seconds after the channel ends.Enemies caught in the area when the channel ends take up to 625/925/1275 (+300% bonus Ability Power) magic damage, depending on how long Absolute Zero was channeled.
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