Briar Runes explained
There's one set of runes for Briar on patch 13.21 that is the clear favorite for LoL players and pros alike. The best Briar rune paths on the position 
Jungle are 
Precision as the primary path and 
Inspiration as the secondary path with a pick rate of 51%. Besides picking runes on Briar you should learn how to play Briar and if you are interested in pro matches take a look on how a pro builds Briar.
Briar runes from primary path
Precision improves attack and sustained damage on Briar 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 
Briar. This keystone rune provides additional power in the later stages of a game. As soon as Conqueror is fully charged, Briar deals additional damage and gains life steal. Other primary runes on Briar are 
Triumph, 
Legend: Tenacity and 
Last Stand.
Triumph restores on Briar a part of missing health and award bonus gold, if a champion is killed. Briar gains extra Tenacity with every additional stage of Legend: Tenacity. With Last Stand you deal more damage while you are at low health.
Briar runes from secondary path
When it comes to your secondary path, most Briar players prefer to go with Inspiration. Inspiration opens creative opportunities on Briar troughout the match. On the Inspiration path, the best runes for Briar are 
Cosmic Insight and 
Magical Footwear.
Cosmic Insight grants summoner spell and item haste. Magical Footwear allows Briar to focus on those essential core items without the need to spend the additional 300 gold on boots.
FAQ for Briar Runes
Which is the best keystone rune on Briar?
The best keystone rune on Briar is Conqueror. This Briar runes setup is then referred as Briar Conqueror.
What runes does Briar use?
Runes from the paths Precision and Inspiration are the most used runes on Briar. For the exact pick rates of Briar runes used, you have to study the rune distribution presented.