Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
this is what ive been using for nunu, its a tank build with some ap. ive noticed if the tank does no dmg he gets ignored and your team suffers for it. abyssal sceptre has magic resist, plus softens up enemies for your ultimate. if im doing really well kill wise or we are winning ill sell the ring and get mejais soulstealer. I use flash to set up my ultimate or get away.