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.
When retreating with low health, be prepared to dodge Lux's Final Spark, a red targeting beam fires prior to the main beam, so try to move to the side if possible.
Lux has powerful zone control abilities. Try to spread out and attack from different directions so she cannot lock down a specific area.
The stat comparisons shown on this page show some important Karthus versus Lux counter stats that can help us appreciate the differences and similarities between the pair. As an example, Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is more than Lux’s KDA ratio of NaN, indicating that Karthus may be more central to his team's team fighting capability than Lux..
Karthus often has a slightly larger longest killing spree than his matchup does. On average, he takes more damage than Lux. This typically indicates different amounts of tankyness, yet it can also hint that the champion with higher HP has less mobility and thus is not able to kite away from further harm when engaged or poked.
Both League champions are great champions. Both have their strengths, weaknesses, and counters. In the game's current meta, Karthus usually loses when taking on Lux, with a 46.5% win rate. Therefore, Karthus makes a poor counter for Lux.
While Karthus does have a lower winrate compared to Lux, when on opposite teams, Karthus also has a greater difficulty level that makes him a more challenging character to learn. You should be very concerned when picking Karthus into Luxas his relative depth means you may not be able to reach his full potential without a lot of practice beforehand.
Moreover, Karthus also has some amount of utility and CC, a similar amount to Lux. This makes her just as valuable during teamfights, especially when fighting champions with a ton of burst damage.
While there is not one best champion overall in League of Legends, in Karthus vs Lux matchups, Lux is the better champion with a much lower win rate, more champion depth, and a similar amount of utility to help out your team members during late stage team fights.
Karthus is a trash counter to Lux. Focus your strategy on keeping up your gold income and clearing objectives. If you are able to do that, you should do very well as Karthus against Lux.
To learn all of the intricacies of Karthus in order to counter Lux during both the lane and mid / late game phases of League of Legends, you should keep reading to learn a few extra tricks and insights into this matchup. If you listen to the build and suggestions presented here, you will increase your win rate by a lot and be closer to League of Legends pro players.
Karthus typically accumulates a similar amount of CS as Lux. Champs who on average don't take much CS typically don't need much CS to be valuable teammates, such as supports. These kinds of champions are capable of scaling well off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, often have to have several high cost items to be effective. In either case, try to surpass the numbers shown here to do well.
The ideal items to focus on in your Karthus versus Lux build consist of Rabadon's Deathcap, Malignance, and Luden's Companion. When Karthus bought at least these three pieces in his build, he did much better vs Lux than with many other typical counter builds. In fact, Karthus had an average winrate of 46.5% when playing against Lux with this build.
To have the greatest chance of vanquishing Lux as Karthus, Karthus players should use the Dark Harvest, Cheap Shot, Eyeball Collection, Ultimate Hunter, Presence of Mind, and Last Stand runes from the Domination and Precision rune sets. Of all the runes we have analyed for Karthus vs Lux counters, this mix of runes yielded the highest win rate. Notably, these runes gave a 46.5% winrate overall.
If you would like to view Karthus vs Lux tips and builds for a a particular division rank, feel free to select one from the selection menu above. By default, the statistics and guides given are computed using all matches run with both champs.