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 feature several influential Karthus vs. Aphelios matchup statistics that can help you explain the distinctions between the two. For instance, Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is more than Aphelios’s ratio of NaN, showing that Karthus may be more central to his team's team fighting capability than Aphelios..
Karthus typically has a similar longest kill spree as his counter does. On average, he takes more damage than Aphelios. This typically indicates different amounts of tankyness; however, it can also show that the one champ has less mobility and thus is not able to kite away from additional damage when engaged or poked.
Both League of Legends champs are great champions. Both have their strengths, weaknesses, and counters. In League's current meta, Karthus usually fairs equally well when taking on Aphelios, with a 49.2% win rate. Thus, Karthus makes an ok counter for Aphelios.
While Karthus does have a lower winrate than Aphelios, when facing one another, Karthus also has a lower difficulty level that makes him a less challenging character to learn. You still need to be cautious when picking Karthus into Apheliosas his relative depth means you may not be able to reach his full potential without a significant amount of practice beforehand.
Moreover, Karthus also has some amount of utility and CC, a similar amount to Aphelios. This makes her just as valuable during teamfights, especially when fighting champions with a lot of burst damage.
While there is not one best champion overall in League of Legends, in Karthus vs Aphelios matchups, Aphelios is the better champion with a similar win rate, less champion complexity, and a similar amount of utility to help out your allies during teamfights.
Karthus is a somewhat poor counter to Aphelios. Focus your play on increasing your gold and cs and clearing objectives. If you are able to do that, you should hold your own as Karthus against Aphelios.
If you would like to truly master Karthus to counter Aphelios during both the lane and mid / late game phases of League of Legends, you should keep reading to learn a few extra tips and tricks for this matchup. If you pay attention to the build and tips shown here, you will grow your win rate by a lot and be that much closer to League of Legends pro players.
Karthus on average racks up less CS as Aphelios. Champs who on average don't take much CS typically don't require much CS to be effective, such as sup champs. They are able to scale properly off of their abilities and first items alone. Yet, champions with a lot of CS, such as hyper-carries, usually require a lot of items to be effective. In either situation, try to surpass the values shown here to do well.
The best items to have in your Karthus versus Aphelios build consist of Rabadon's Deathcap, Malignance, and Stormsurge. When Karthus included at least these three pieces in his build, he performed significantly better versus Aphelios than with most other commonly used counter builds. In fact, Karthus had an average winrate of 49.2% when countering Aphelios with this build.
To have the greatest likelihood of crushing Aphelios as Karthus, Karthus players should use the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Eyeball Collection, and Ultimate Hunter runes from the Inspiration and Domination rune sets. Out of all the rune builds that we analyzed for Karthus vs Aphelios matchups, this mix of runes resulted in the best win rate. In fact, these runes gave a 49.2% winrate overall.
By default, tips, statistics, and builds on how to beat Aphelios as Karthus are shown for all skill levels combined. If you want to scope the stats and builds to a distinct rank, you should use the selection menu earlier in the counter matchup guide.