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!
Karthus can cast spells for a short duration after he is killed. Move away from his corpse to be safe.
Make sure you always have enough health to survive Requiem, even if you have to go back to the base more frequently to heal.
The stats provided here underscore several strategic Rengar versus Karthus matchup stats that can help you explain the differences and similarities between these two champions. As an example, Rengar’s KDA ratio ([kills + assists] / deaths) of NaN is better than Karthus’s KDA ratio of NaN, showing that Rengar may be more central to his team's team fighting capacity than Karthus..
Rengar normally has a similar longest kill spree as his matchup does. Typically, he takes more damage than Karthus. This commonly reflects different amounts of tankyness, yet it can also show that the champion with more HP has less agility and thus is not able to flee from further damage when poked or engaged.
Both League of Legends champs are great. Both champs have their pros and cons. In League's current meta, Rengar usually fairs equally well when facing off against Karthus, with a 49.6% win rate. Therefore, Rengar makes an ok counter for Karthus.
While Rengar does have a lower winrate than Karthus, when they face off with one another, Rengar also has a greater difficulty level that makes him a more complex champ to develop with. You should be careful when picking Rengar into Karthusas his relative depth means that you may not be able to unleash his full potential without a significant amount of practice beforehand.
Furthermore, Rengar also has almost no amount of utility and CC, a similar amount to Karthus. This makes her just as valuable during teamfights, especially when facing champions with a ton of burst damage.
While there is not one best champion in League of Legends, in Rengar vs Karthus matchups, Karthus is the better champion with a similar win rate, more champion depth, and a similar amount of utility to help out your team members during late stage team fights.
Rengar is a somewhat poor counter for Karthus. Make sure you focus your gameplay on keeping up your CS and clearing objectives. If you do that, you should be able to stand on your own as Rengar against Karthus.
To truly master Rengar in order to counter Karthus during both the lane and mid / late game phases of League of Legends, you should continue reading to learn a few extra lessons on this matchup. If you mind the build and tips presented here, you will increase your win rate significantly and be that much closer to League of Legends pro players.
Rengar typically picks up less CS as Karthus. Champions who typically don't take much CS often don't have to have much CS to be valuable teammates, such as sup champs. They are capable of scaling well off of their skills, stats, and first items alone. Yet, champs with a lot of CS, such as hyper-carries, often have to have a lot of items to be effective. In either situation, try to do better than the values displayed on this page to do well.
The best items to use in your Rengar versus Karthus build consist of Duskblade of Draktharr, Lord Dominik's Regards, and Essence Reaver. When Rengar combined at least these three pieces in his build, he performed much better when facing Karthus than with most other typical counter builds. In fact, Rengar boasted an average winrate of 49.6% when playing against Karthus with this counter build.
To have the best probability of annihilating Karthus as Rengar, you should equip the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Sudden Impact, and Treasure Hunter runes from the Inspiration and Domination rune sets. Of all the runes we have analyed for Rengar vs Karthus LoL games, this composite of runes yielded the greatest win rate. Notably, these runes provided a 49.6% win rate overall.
By default, tips, statistics, and builds on how to beat Karthus as Rengar are shown for every ranked division. If you would like to scope the statistics and builds to a specific division, you should use the selection menu above.