Soraka Runes explained
There's one set of runes for Soraka on patch 14.23 that is the clear favorite for LoL players and pros alike. The best Soraka rune paths on the position 
Support are 
Sorcery as the primary path and 
Resolve as the secondary path with a pick rate of 82%. Besides picking runes on Soraka you should learn how to play Soraka and if you are interested in pro matches take a look on how a pro builds Soraka. If you want to discuss 
Soraka then you should visit the champion subreddit.
Soraka runes from primary path
Sorcery empoweres abilities of Soraka and increases the available champion resources. Most of high elo players – and our LoL pros in the the major regions – have agreed that 
Summon Aery is the best keystone rune to run on Soraka. This keystone rune adds more poke damage to your abilities. And additionally grants an extra shield, whenever Soraka empowers or protects an ally with abilities. Other primary runes on Soraka are 
Manaflow Band, 
Transcendence and 
Scorch.
This is usually followed up by taking Manaflow Band for additional mana and mana regenaration. Transcendence for some more Ability Haste. Scorch increases your control in the early game.
Soraka runes from secondary path
When it comes to your secondary path, most Soraka players prefer to go with Resolve. Resolve empowers the survivability of Soraka and increases the tankiness. On the Resolve path, the best runes for Soraka are 
Revitalize and 
Bone Plating.
Revitalize inceases heals and shields you distribute or receive. Bone Plating make Soraka overall tankier, by decreasing the amount of poke damage in the early game.
FAQ for Soraka Runes
Which is the best keystone rune on Soraka?
The best keystone rune on Soraka is Summon Aery. This Soraka runes setup is then referred as Soraka Summon Aery.
What runes does Soraka use?
Runes from the paths Sorcery and Resolve are the most used runes on Soraka. For the exact pick rates of Soraka runes used, you have to study the rune distribution presented.