Rengar Runes explained
There's one set of runes for Rengar on patch 14.12 that is the clear favorite for LoL players and pros alike. The best Rengar rune paths on the position 
Jungle are 
Precision as the primary path and 
Domination as the secondary path with a pick rate of 45%. Besides picking runes on Rengar you should learn how to play Rengar and if you are interested in pro matches take a look on how a pro builds Rengar. If you want to discuss 
Rengar then you should visit the champion subreddit.
Rengar runes from primary path
Precision improves attack and sustained damage on Rengar 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 Rengar. This keystone rune provides additional power in the later stages of a game. As soon as Conqueror is fully charged, Rengar deals additional damage and gains life steal. Other primary runes on Rengar are 
Triumph, 
Legend: Alacrity and 
Coup de Grace.
Triumph restores on Rengar a part of missing health and award bonus gold, if a champion is killed. Legend: Alacrity grants additional attack speed to Rengar. Rengar deals with Coup de Grace more damage to targets with low health.
Rengar runes from secondary path
When it comes to your secondary path, most Rengar players prefer to go with Domination. Domination improves burst damage and assassination tools on Rengar. On the Domination path, the best runes for Rengar are Sudden Impact and Eyeball Collection.
Sudden Impact increases your damage after dashing or being invisible. This is due to how easy it is to activate on Rengar with the amount of ways he has to dash, jump or going invisible. The additional lethality helps to take down the priority targets that much easier. Eyeball Collection is next up. This grants the user additional damage with every killing they score.
FAQ for Rengar Runes
Which is the best keystone rune on Rengar?
The best keystone rune on Rengar is Conqueror. This Rengar runes setup is then referred as Rengar Conqueror.
What runes does Rengar use?
Runes from the paths Precision and Domination are the most used runes on Rengar. For the exact pick rates of Rengar runes used, you have to study the rune distribution presented.