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.
For this build I tried to make nunu a nuke that can still take some damage. I got boots first sorrcerers instead of mercury for spell pen. I then get banshees veil because it absorbs one spell which can help for when you are trying to ult. Then getting rod of ages for health mana ability power. I then get lich bane because it gives ap magic resist mana and speed not to mention makes physical attacks do more. I follow up with the rylai scepter for more health, ap and the slowing ability and finishing up with zonyas ring for more ability power.
Play safe and harass tons with ice blast. Make sure to only use consume when you need health. Always cast blood boil on who you are in the lane with cause then you both move faster than your enemies. Unless a clear opportunity presents itself do not try and get kills yet.
Keep up the harassing and even try and get in with your ult. Try and time your ult with banshees absorbing feature so they don't interrupt it. At this point you are still not truly a tank but can tank if their are minions near to eat. Work with your team mates to finish off people and surprise crowds with your ult. Also it is very nice once you have the scepter because then your ult really slows people down not to mention if you ice blast run next to then ult because then they are moving at like half the speed
Your a tank that can also nuke. So with your group you can charge in and try and be the turning point in team fights by using your ult. Make sure to abuse consume. Keep in mind even though you can tank you are semi vulnerable to strong dps classes.
A tank that has really high nuking capabilities
Easy to regan health by eating minions.
Can move very fast.
Your ult can be interrupted
You do not have very frequently strong attacks.
You have a small child on your back that sounds stupid.
As always with my builds feel free to comment any questions or concerns thank you.