Darius Runes explained
There's one set of runes for Darius on patch 14.9 that is the clear favorite for LoL players and pros alike. The best Darius rune paths on the position 
Top are 
Precision as the primary path and 
Sorcery as the secondary path with a pick rate of 45%. Besides picking runes on Darius you should learn how to play Darius and if you are interested in pro matches take a look on how a pro builds Darius. If you want to discuss 
Darius then you should visit the champion subreddit.
Darius runes from primary path
Precision improves attack and sustained damage on Darius troughout the match. Most of high elo players – and our LoL pros in the the major regions – have agreed that 
Conqueror is the best keystone rune to run on Darius. This keystone rune provides additional power in the later stages of a game. As soon as Conqueror is fully charged, Darius deals additional damage and gains life steal. Other primary runes on Darius are 
Triumph, 
Legend: Alacrity and 
Last Stand.
Triumph restores on Darius a part of missing health and award bonus gold, if a champion is killed. Legend: Alacrity grants additional attack speed to Darius. With Last Stand you deal more damage while you are at low health.
Darius runes from secondary path
When it comes to your secondary path, most Darius players prefer to go with Sorcery. Sorcery empoweres abilities of Darius and increases the available champion resources. On the Sorcery path, the best runes for Darius are 
Celerity and 
Nimbus Cloak.
Celerity boosts all movement speed bonuses to Darius. 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.
FAQ for Darius Runes
Which is the best keystone rune on Darius?
The best keystone rune on Darius is Conqueror. This Darius runes setup is then referred as Darius Conqueror.
What runes does Darius use?
Runes from the paths Precision and Sorcery are the most used runes on Darius. For the exact pick rates of Darius runes used, you have to study the rune distribution presented.