Make sure to take paths through brush when chasing opponents to take advantage of Rengar's passive.
Use Rengar's ultimate to find and assassinate high priority targets in team fights and skirmishes.
A lot of Rengar's power comes from empowered abilities he uses at the right moment - choose wisely!
Use the time after Sion has died to reposition and prepare for his return.
Even if Sion still hits a Decimating Smash, making him release the charge earlier reduces its impact.
The stats provided here underscore several strategic Rengar versus Sion matchup stats that can help you appreciate the distinctions between this set of champs. Rengar’s KDA ratio ([kills + assists] / deaths) of NaN is more than Sion’s ratio of NaN, demonstrating that Rengar may be more central to his team's team fighting potential than Sion. This observation is in large part caused by the difference in kills.
Rengar normally has a much larger longest kill spree than his counter does. On average, he receives less damage than Sion. This is usually reflective of differing health capacities, but it can also indicate that the one champion has less mobility and thus is unable to kite away from further harm when engaged or poked.
Both League of Legends champions are great. Both champs have their pros and cons. In League's current meta, Rengar usually loses when playing against Sion, with a 48.5% win rate. As a result, Rengar makes a poor counter for Sion.
While Rengar does have a lower win rate compared to Sion, when facing one another, Rengar also has a much greater level of difficulty that makes him a more time consuming character to learn and master. You should be careful when picking Rengar into Sionas his relative depth means you may not be able to unleash his full potential without a significant amount of practice beforehand.
Additionally, Rengar has almost no amount of CC and other utility, a similar amount to Sion. This makes her just as valuable during teamfights, especially when trying to counter champions with a ton of burst damage.
While there is not a single best champion for every situation in League of Legends, in Rengar vs Sion matchups, Sion is the better champion with a lower win rate, more champion depth, and a similar amount of utility to help out your teammates during teamfights.
Rengar is a somewhat poor counter to Sion. Make sure you focus your strategy on maximizing your gold income and clearing objectives. If you can do that, you should do very well as Rengar against Sion.
If you would like to learn all of the intricacies of Rengar in order to counter Sion during both the laning and mid / late game phases of League of Legends, you should continue reading to gather a few extra tricks and insights into this matchup. If you mind the build and stats presented here, you will grow your win rate significantly and be closer to League of Legends pro players.
Rengar often gets a lot less CS compared to Sion. Champions who on average don't get many minion kills typically don't require much CS to be effective, such as supports. They are capable of scaling properly off of their abilities and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, usually require many items to be effective. In either case, try to exceed the values reported on this page to do well.
The most crucial items to prioritize in your Rengar versus Sion build consist of Edge of Night, Serylda's Grudge, and Hubris. When Rengar incorporated at least these three pieces in his build, he performed a lot better against Sion than with most other commonly used builds. In fact, Rengar had an average win rate of 48.5% when playing against Sion with this build.
To have the highest likelihood of crushing Sion as Rengar, you should equip the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Sudden Impact, and Ultimate Hunter runes from the Inspiration and Domination rune sets. Of all the rune combinations players picked for Rengar vs Sion LoL games, this mixture of runes resulted in the greatest win rate. Moreover, these runes gave a 48.5% winrate overall.
If you would like to see Rengar x Sion tips and counter builds for a a specific skill level, feel free to choose one from the selection menu provided above. At first, the statistics and guides given are calculated using every round run with both champions.