Nunu & Willump Runes explained
There's one set of runes for Nunu & Willump on patch 14.20 that is the clear favorite for LoL players and pros alike. The best Nunu & Willump rune paths on the position 
Jungle are 
Sorcery as the primary path and 
Resolve as the secondary path with a pick rate of 52%. Besides picking runes on Nunu & Willump you should learn how to play Nunu & Willump and if you are interested in pro matches take a look on how a pro builds Nunu & Willump. If you want to discuss 
Nunu & Willump then you should visit the champion subreddit.
Nunu & Willump runes from primary path
Sorcery empoweres abilities of Nunu & Willump and increases the available champion resources. Most of high elo players – and our LoL pros in the the major regions – have agreed that 
Phase Rush is the best keystone rune to run on Nunu & Willump. Phase Rush offers more flexibility and options to betake oneself in and out of danger, which can be helpful since that's essentially the main playstyle of Nunu & Willump. Other primary runes on Nunu & Willump are 
Nimbus Cloak, 
Celerity and 
Waterwalking.
Nimbus Cloak, which grants movement speed upon using a summoner spell, works amazingly well with junglers in particular as they take the shortest cooldown summoner spell, Smite. Celerity boosts all movement speed bonuses to Nunu & Willump. Waterwalking grants movement speed in the river, which helps Nunu & Willump get around the map quicker. The extra damage will also help in those all important dragon and baron fights.
Nunu & Willump runes from secondary path
When it comes to your secondary path, most Nunu & Willump players prefer to go with Resolve. Resolve empowers the survivability of Nunu & Willump and increases the tankiness. On the Resolve path, the best runes for Nunu are Conditioning and Overgrowth.
Conditioning powers up Nunu & Willump tankiness after the laning phase. Overgrowth increases your maximum amount of health.
FAQ for Nunu & Willump Runes
Which is the best keystone rune on Nunu & Willump?
The best keystone rune on Nunu & Willump is Phase Rush. This Nunu & Willump runes setup is then referred as Nunu & Willump Phase Rush.
What runes does Nunu & Willump use?
Runes from the paths Sorcery and Resolve are the most used runes on Nunu & Willump. For the exact pick rates of Nunu & Willump runes used, you have to study the rune distribution presented.