Lux Runes explained
There's one set of runes for Lux on patch 15.13 that is the clear favorite for LoL players and pros alike. The best Lux rune paths on the position 
Support are 
Sorcery as the primary path and 
Domination as the secondary path with a pick rate of 46%. Besides picking runes on Lux you should learn how to play Lux and if you are interested in pro matches take a look on how a pro builds Lux. If you want to discuss 
Lux then you should visit the champion subreddit.
Lux runes from primary path
Sorcery empoweres abilities of Lux and increases the available champion resources. Most of high elo players – and our LoL pros in the the major regions – have agreed that 
Arcane Comet is the best keystone rune to run on Lux. This keystone rune adds more damage to your abilities and increases your power in the laning phase. Other primary runes on Lux 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.
Lux runes from secondary path
When it comes to your secondary path, most Lux players prefer to go with Domination. Domination improves burst damage and assassination tools on Lux. On the Domination path, the best runes for Lux are 
Cheap Shot and 
Ultimate Hunter.
Cheap Shot makes you deal more damage to enemies with impaired movement, which has great synergy with the setup of Lux. Ultimate Hunter scales up Lux ultimate haste on every unique champion takedown.
FAQ for Lux Runes
Which is the best keystone rune on Lux?
The best keystone rune on Lux is Arcane Comet. This Lux runes setup is then referred as Lux Arcane Comet.
What runes does Lux use?
Runes from the paths Sorcery and Domination are the most used runes on Lux. For the exact pick rates of Lux runes used, you have to study the rune distribution presented.