Innate:Nunu's and Willump's next instance of damage dealt to an enemy champion, large monster or structure grants both Willump and the nearest allied champion Call of the Freljord for 4 seconds, prioritizing the ally with highest attack speed.
Call of the Freljord: Targets gain 20% bonus attack speed and 10% bonus movement speed. Additionally, Willump gains splash damage on his basic attacks, dealing 30% AD physical damage to enemies in a cleave centered on his target.
Nunu and Willump cannot trigger Call of the Freljord from the same enemy again for a time. Successive triggers of Call of the Freljord will stack the duration.
The splash damage will critically strike when the basic attack does, without dealing any bonus damage but benefiting from Infinity Edge's critical damage conversion.
If the ability would deal lethal damage and the target is a minion or small-medium monster, it will instead perform an unique animation, stunning and pulling them, then subsequently dealing their current health as true damage.
Triggering this will cause spell vamp to heal less than normal.
Active:Willump breaks free of active slowing effects and conjures a snowball that he begins rolling in the target direction for up to 10 seconds, increasing in size and power over 5 seconds. He can turn at a very narrow angle that increases while turning in the same direction (resetting upon changing direction).
The duo are slowed by 50% for the first 1 second, but are immune to other slows for the duration of the charge. After a delay, the duo gain 14 movement speed every 0.25 seconds, up to the greater value between 「 Total MS + 85 」「 Total Uncapped Flat MS + 85 」 (click to toggle). The bonus movement speed from Biggest Snowball Ever! ignores the movement speed cap.
The snowball rolls over minions and small monsters in its path dealing magic damage, with the base damage increased by 0% − 400% (based on charge time) and the ratio increased by 0% − 66.67% (based on charge time).
After 10 seconds, upon re-activation after 0.5 seconds, or if the duo are interrupted, they will let loose the snowball, sending it rolling forward for an additional 1.4 − 2 (based on charge time) seconds, during which it will not grow any larger and will explode when colliding with any enemy unit. Its size resets if released before 2.5 seconds.
The time threshold to begin gaining bonus movement speed may be bugged, as Flat Bonus MS increases the time while % Bonus MS decreases the time.
The formula appears to be (X / 100) - Y, where:
X = Total Flat MS after caps
Y = 0.1 per 1% %MS
The delay is not modified from its initially calculated value on-cast, even if additional movement speed is gained.
Nunu's movement speed always increases in increments of ~14, regardless of which total value he will reach. This takes 6 increments to reach the Total MS + 85, but may take more to reach the Uncapped Flat + 85. Due to flat bonuses increasing the time threshold, it is possible for the ability's effects to end before reaching the total uncapped movement speed.
If Nunu turns continuously he will create a 600 unit circle, increased with bonus movement speed, striking the same point up to 3 times, for a maximum of 180 / 225 / 270 / 315 / 360 (+ 300% AP) magic damage. The damage can be further increased by detonating the snowball, for a total of 360 / 450 / 540 / 630 / 720 (+450% AP) magic damage.
Ryze'sRealm Warp will only teleport Nunu and Willump, leaving the snowball behind.
Hovering the cursor on the HUD (e.g minimap / champion portraits) does not affect the cast and steering of Biggest Snowball Ever!.
Even though the ability doesn't have a distance limit, casting the ability outside its cast range (7500 units), will have Nunu and Willump attempt to walk in range before charging.
Active:Nunu and Willumpsap heat from the surrounding area, slowing affected enemies by 0% − 95% (based on channel time), as well as gaining a shield. The affected area is hidden if the duo is not visible to the enemy team.
65 / 75 / 85 (+ 30 / 40 / 50% bonus health)
After 3 seconds or if the duo is interrupted, surrounding enemies take magic damage, reduced by 100% − 0% (based on channel time). Once the channel ends, affected enemies will remain slowed for 0 − 3 (based on channel time) seconds and any remaining shield will decay over 3 seconds.
625 / 950 / 1275 (+ 250% AP)
The duo can interrupt the ability after 0.5 seconds by inputting a movement command or casting one of their other abilities.