Rengar's passive enables him to leap out of brush, so avoid fighting him when near bushes.
Rengar puts an indicator over the nearest enemy champion when he is camouflaged during his ultimate.
Rengar gains an empowered ability when his resource bar is full. Try to confront him when it's low.
The stats provided here highlight several important Vex versus Rengar matchup stats that can help you grasp the distinctions between the pair. Vex’s KDA ratio ([kills + assists] / deaths) of NaN is better than Rengar’s KDA ratio of NaN, demonstrating that Vex may be more central to their team's team fighting capability than Rengar..
Vex usually has a similar longest killing spree as their enemy does. Commonly, they takes less damage than Rengar. This is usually reflective of different amounts of tankyness, but it can also imply that the champion with increased HP has less agility and thus is unable to flee from further harm when engaged or poked.
Both League champions are great champions. Both have their pros and cons. In the game's current meta, Vex usually loses when trying to fight Rengar, with a 48.7% win rate. Thus, Vex makes a bad counter to Rengar.
While Vex does have a lower win rate than Rengar, when they face off with one another, Vex also has a much lower learning curve that makes them a less difficult champion to develop with. You should be careful when picking Vex into Rengar.
Moreover, Vex also has some amount of utility and CC, a similar amount to Rengar. This often makes her just as valuable during teamfights, especially when trying to counter champions with a ton of burst damage.
While there isn't one best champion for every situation in League of Legends, in Vex vs Rengar matchups, Rengar is the better champion with a lower win rate, less champion complexity, and a similar amount of utility to help out your team members during team fights.
Vex is a somewhat poor counter to Rengar. You will do well by focussing your actions on keeping up your gold income and clearing objectives. If you do that, you should be able to stand on your own as Vex against Rengar.
To truly master Vex to counter Rengar during both the early game and mid / late game phases of League of Legends, you should continue reading to learn a few extra lessons on this matchup. If you listen to the build and tips presented above, you should increase your win rate by a lot and be that much closer to League of Legends pro players.
Vex typically gets much more CS compared to Rengar. Champs who on average don't take much CS often don't need much CS to be valuable teammates, such as support champions. These kinds of champions are able to scale properly off of their skills, stats, and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, usually need a lot of items to be effective. In either situation, try to do better than the values reported on this page to do well.
The best items to focus on in your Vex versus Rengar build include Rabadon's Deathcap, Zhonya's Hourglass, and Luden's Companion. When Vex included at least these three items in their build, they did a lot better against Rengar than with many other typical counter builds. In fact, Vex had an average win rate of 48.7% battling Rengar with this counter build.
To have the greatest likelihood of coming out on top against Rengar as Vex, Vex players should equip the Electrocute, Taste of Blood, Eyeball Collection, Ultimate Hunter, Manaflow Band, and Transcendence runes from the Domination and Sorcery rune sets. Out of all the rune sets players used for Vex vs Rengar clashes, this order of runes yielded the greatest win rate. Moreover, these runes provided a 48.7% win rate overall.
If you need to view Vex x Rengar tips and builds for a an individual skill level, feel free to choose one from the selection menu provided above. At first, the statistics and guides shown are computed using all games played with these champions.