Aatrox Runes explained
There's one set of runes for Aatrox on patch
12.10
that is the clear favorite for LoL players and pros alike. The best Aatrox Runes on the position 
Top are Precision as the primary path and
Resolve as the secondary path with a pick rate of 98%. Besides runes you should take a look on Aatrox Build and if you are interested in pro matches take a look at Aatrox Probuilds. If you want to discuss
Aatrox then you should visit the champion subreddit.
Primary runes path on Aatrox
Precision improves attack and sustained damage on Aatrox 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
Aatrox. This keystone rune provides additional power in the later stages of a game. As soon as
Conqueror is fully charged, Aatrox deals additional damage and gains life steal. Other primary runes on Aatrox are
Triumph,
Legend: Tenacity and
Last Stand.
Triumph restores on Aatrox a part of missing health and award bonus gold, if a champion is killed. Aatrox gains extra Tenacity with every additional stage of
Legend: Tenacity. With
Last Stand you deal more damage while you are at low health.
Secondary runes path on Aatrox
When it comes to your secondary path, most
Aatrox players prefer to go with
Resolve.
Resolve empowers the survivability of Aatrox and increases the tankiness. On the
Resolve path, the best runes for Aatrox are
Second Wind and
Unflinching.
Second Wind powers up your sustainablity in lane by healing after taking damage from an enemy champion.
Unflinching inceases Aatrox tenacity based on your missing health.
FAQ for Aatrox Runes
Which is the best keystone rune on Aatrox?
The best keystone rune on Aatrox is
Conqueror. This Aatrox runes setup is then referred as Aatrox Conqueror.