Lay Waste is very strong at farming minions and harassing enemy champions.
Ask your allies to help point out when you should use Requiem to get kills in different lanes.
Jinx's ultimate does less damage the closer you are to her.
Jinx's minigun takes time to ramp up. If you see her poking with rockets try to jump on her and burst her down.
Jinx's snare grenades have a long cooldown and are her primary means of protecting herself. If she misses with them she will have a hard time escaping if engaged upon.
The stats provided here highlight some valuable Karthus versus Jinx counter statistics that can help you figure out the differences and similarities between the pair. Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is more than Jinx’s ratio of NaN, indicating that Karthus may be more central to his team's team fighting capacity than Jinx..
Karthus typically has a similar longest killing spree as his opponent does. Commonly, he receives more damage than Jinx. This typically indicates different amounts of tankyness; however, it can also hint that the one champion has less mobility and thus is unable to flee from additional damage when engaged or poked.
Both League champs are great. Both have their strengths, weaknesses, and counters. In the game's current meta, Karthus usually fairs equally well when taking on Jinx, with a 49.0% win rate. Thus, Karthus makes an ok counter to Jinx.
While Karthus does have a lower winrate compared to Jinx, when on opposite teams, Karthus also has a greater difficulty level that makes him a more time consuming champion to pick up and master. You should be careful when picking Karthus into Jinxas his relative depth means you may not be able to unleash his full potential without a lot of practice beforehand.
Moreover, Karthus also has some amount of CC and other utility, a similar amount to Jinx. This often makes her just as valuable during team fights, especially when trying to counter champions with a lot of burst damage.
While there isn't one best champion for every situation in League of Legends, in Karthus vs Jinx matchups, Jinx is the better champion with a similar win rate, more champion depth, and a similar amount of utility to help out your allied champions during team fights.
Karthus is a somewhat poor counter for Jinx. You will do well by focussing your play on maximizing your CS and taking out objectives. If you do that, you should hold your own as Karthus against Jinx.
To truly master Karthus in order to counter Jinx during both the laning and mid / late game phases of League of Legends, you should continue reading to learn a few extra tricks and insights into this matchup. If you listen to the build and stats displayed above, you should increase your win rate significantly and be that much closer to League of Legends pro players.
Karthus most often picks up less CS compared to Jinx. Champs who typically don't get much CS often don't have to have much CS to be effective, such as support champions. They are able to scale properly off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, usually require many items to be effective. In either situation, try to exceed the values reported on this page to do well.
The most crucial items to have in your Karthus versus Jinx build include Rabadon's Deathcap, Malignance, and Stormsurge. When Karthus used at least these three items in his build, he did significantly better versus Jinx than with most other commonly used builds. In fact, Karthus boasted an average win rate of 49.0% battling Jinx with this counter build.
To have the greatest probability of annihilating Jinx as Karthus, Karthus players should take the Dark Harvest, Cheap Shot, Eyeball Collection, Treasure Hunter, Coup de Grace, and Presence of Mind runes from the Domination and Precision rune sets. Out of all the rune builds players used for Karthus vs Jinx battles, this mix of runes yielded the greatest win rate. Notably, these runes gave a 49.0% winrate overall.
If you would like to get Karthus vs Jinx tips and builds for a a particular division, feel free to choose one from the selection menu shown above. By default, the stats and guides given are calculated using all rounds completed with both champs.