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.
Each of Aphelios' weapons have different weaknesses, try to exploit the ones that work best for your champion. Watch out for the purple Gravity gun, it can root you.
The stat comparisons shown on this page show some valuable Karthus versus Aphelios counter statistics that can help you interpret the differences and similarities between the pair. For instance, Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is better than Aphelios’s KDA ratio of NaN, demonstrating that Karthus may be more central to his team's team fighting effectiveness than Aphelios..
Karthus usually has a similar longest kill spree as his opponent does. On average, he takes more damage than Aphelios. This typically indicates differing health capacities, yet it can also indicate that the one champion has less mobility and thus is unable to flee from further damage when engaged or poked.
Both League champions are great. Both champs have their strengths, weaknesses, and counters. In League's current meta, Karthus usually loses when playing against Aphelios, with a 47.1% win rate. As a result, Karthus makes a bad counter for Aphelios.
While Karthus does have a lower win rate than Aphelios, when they face off with one another, Karthus also has a lower difficulty level that makes him a less time consuming champion to develop with. You should be very concerned when picking Karthus into Apheliosas his relative depth means that you may not be able to reach his full potential without a lot of practice beforehand.
Additionally, Karthus also has some amount of CC and other utility, a similar amount to Aphelios. 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 in League of Legends, in Karthus vs Aphelios matchups, Aphelios is the better champ with a lower win rate, less champion complexity, and a similar amount of utility to help out your allies during late stage team fights.
Karthus is a terribly counter to Aphelios. 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 Karthus against Aphelios.
If you would like to learn all of the intricacies of Karthus in order to counter Aphelios during both the early game and mid / late game phases of League of Legends, you should continue reading to learn a few extra tips and tricks for this matchup. If you pay attention to the build and stats shown here, you will grow your win rate significantly and be closer to League of Legends pro players.
Karthus typically racks up less CS as Aphelios. Champions who typically don't acquire much CS often don't need much CS to be valuable teammates, such as sup champs. These kinds of champions are able to scale properly off of their skills, stats, and first items alone. Yet, champs with a lot of CS, such as hyper-carries, usually have to have several high cost items to be effective. In either situation, try to exceed the values displayed here to do well.
The most crucial items to prioritize in your Karthus versus Aphelios build consist of Liandry's Anguish, Rabadon's Deathcap, and Zhonya's Hourglass. When Karthus included at least these three pieces in his build, he did much better when fighting Aphelios than with many other typical counter builds. In fact, Karthus had an average winrate of 47.1% when playing against Aphelios with this counter build.
To have the highest chance of defeating Aphelios as Karthus, you should take 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 rune builds players used for Karthus vs Aphelios counter picks, this mix of runes resulted in the greatest win rate. In fact, these runes gave a 47.1% win rate overall.
If you would like to see Karthus x Aphelios tips and matchup stats and build suggestions for a a distinct skill level, feel free to select one from the selection menu provided above. By default, the statistics and build suggestions displayed are computed using every game finished with these champs.