Amumu Runes explained
There's one set of runes for Amumu on patch 14.16 that is the clear favorite for LoL players and pros alike. The best Amumu rune paths on the position 
Support are 
Resolve as the primary path and 
Domination as the secondary path with a pick rate of 96%. Besides picking runes on Amumu you should learn how to play Amumu and if you are interested in pro matches take a look on how a pro builds Amumu. If you want to discuss 
Amumu then you should visit the champion subreddit.
Amumu runes from primary path
Resolve empowers the survivability of Amumu and increases the tankiness. Most of high elo players – and our LoL pros in the the major regions – have agreed that Aftershock is the best keystone rune to run on Amumu. This keystone rune bulks you up, increasing both armour and magic resistance, once you immobilized a champion. Aftershock synergises both with the sheer amount of crowd control Amumu possesses and the need to be tanky as soon as you engage. Other primary runes on Amumu are Font of Life, Bone Plating and Overgrowth.
Font of Life provides your teammates with more sustain by healing them whenever they attack a champion whose movement you've recently impaired. Bone Plating make Amumu overall tankier, by decreasing the amount of poke damage in the early game. Overgrowth increases your maximum amount of health.
Amumu runes from secondary path
When it comes to your secondary path, most Amumu players prefer to go with Domination. Domination improves burst damage and assassination tools on Amumu. On the Domination path, the best runes for Amumu are 
Ultimate Hunter and 
Sudden Impact.
Ultimate Hunter scales up Amumu ultimate haste on every unique champion takedown. Sudden Impact increases your damage after dashing or being invisible. This is due to how easy it is to activate on Amumu with the amount of ways he has to dash, jump or going invisible. The additional lethality helps to take down the priority targets that much easier.
FAQ for Amumu Runes
Which is the best keystone rune on Amumu?
The best keystone rune on Amumu is Aftershock. This Amumu runes setup is then referred as Amumu Aftershock.
What runes does Amumu use?
Runes from the paths Resolve and Domination are the most used runes on Amumu. For the exact pick rates of Amumu runes used, you have to study the rune distribution presented.