Suggested Change for Nunu

Nunu is a Warden, his job is to defend his team by controlling and disrupting the enemy team, and to be tanky while doing it.

However, he cannot make use of the new Courage of the Colossus mastery, so we should introduce a way for him to do it. He was already nerfed for how much health he can stack before SotA was removed, after all.

W - Blood Boil: REMOVED

New Ability - Avalanche Cost 50/60/70/80/90 mana Cooldown 10/9.5/9/8.5/8 seconds

Willump leaps in the air and smashes the ground around him, knocking all nearby enemies Airborne for 1.5 seconds.

The area is slightly larger than Rek'sai's Unburrow (because Nunu is far less mobile than her)

If Nunu has channeled Absolute Zero for at least one second, he can cast Avalanche to knock all enemies in the area of Absolute Zero Airborne for 1.5/1.75/2 seconds (scales with R rank). This ends the channel and all affected enemies take 0 damage from Absolute Zero.

So it's like a defensive Malphite ult, except it costs way more mana, has a channel time and no gap closer. I think this is fair.

Increase Nunu's base MS by 5 to compensate for the loss of Blood Boil and call it a day. No reason one of League's oldest true tanks should be denied the pure tank keystone.