Concept for new Nunu Ulti

I'll just get to it:

Avalanche Nunu (Willump) roars to the skies and summons a mighty avalanche to crash down to target location, dealing damage in an AOE and covering the AOE in "Heavy Snow". Units that move through "Heavy Snow" have reduced Movement Speed- and Heavy Snow is lifted in areas that have been walked through (this is ALMOST similar to the Elixir of Iron mechanic or Nocturne's shadow path thing- if a unit walks through the snow they create a path.) Additionally: Nunu's W protects him and targeted ally from the Movement Speed debuff as they walk into Heavy Snow.