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.
Killing Tentacles whenever possible will make it much easier to win a fight against Illaoi.
When your spirit gets pulled out, fight back if you can. Dealing damage to Illaoi reduces the spirit's duration.
Avoid grouping up for Leap of Faith to reduce the number of Tentacles available to Illaoi.
The stats provided here clarify several significant Karthus versus Illaoi 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 Illaoi’s ratio of NaN, demonstrating that Karthus may be more central to his team's team fighting potential than Illaoi. This observation is largely caused by the differences in assists.
Karthus typically has a slightly larger longest kill spree than his matchup does. On average, he receives less damage than Illaoi. This commonly reflects different amounts of tankyness, yet it can also hint that the champion with increased health has less agility and thus is unable to kite away from additional harm when engaged or poked.
Both LoL champions are great champions. Both have their strengths, weaknesses, and counters. In the game's current meta, Karthus usually fairs equally well when taking on Illaoi, with a 50.5% win rate. As a result, Karthus makes an ok counter to Illaoi.
While Karthus does have a higher win rate compared to Illaoi, when they face off with one another, Karthus also has a much greater learning curve that makes him a more difficult champion to pick up and master. You should be careful when picking Karthus into Illaoias his relative depth means you may not be able to unleash his full potential without a lot of practice beforehand.
Furthermore, Karthus also has some amount of CC and other utility, a similar amount to Illaoi. This makes her just as valuable during team fights, especially when trying to counter champions with a ton of burst damage.
While there isn't one best champion overall in League of Legends, in Karthus vs Illaoi matchups, Karthus is the better champion with a similar win rate, more champion depth, and a similar amount of utility to help out your allies during team fights.
Karthus is a decent counter to Illaoi. Make sure you focus your strategy on keeping up your gold income and taking out objectives. If you can do that, you should be able to stand on your own as Karthus against Illaoi.
To learn all of the intricacies of Karthus in order to counter Illaoi during both the laning and mid / late game phases of League of Legends, you should continue reading to gather a few extra tricks and insights into this matchup. If you mind the build and tips displayed here, you will grow your win rate significantly and be closer to League of Legends pro players.
Karthus often racks up less CS relative to Illaoi. Champs who typically don't get many minion kills typically don't need much CS to be valuable teammates, such as support champions. These kinds of champions are capable of scaling well off of their skills, stats, and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, typically need a lot of items to be effective. In either case, try to surpass the values reported here to do well.
The most important items to have in your Karthus versus Illaoi build include Rabadon's Deathcap, Malignance, and Liandry's Torment. When Karthus incorporated at least these three items in his build, he did a lot better countering Illaoi than with many other commonly used builds. In fact, Karthus boasted an average win rate of 50.5% battling Illaoi with these items in his kit.
To have the greatest probability of defeating Illaoi as Karthus, Karthus players should take 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 combinations players chose for Karthus vs Illaoi face-offs, this combo of runes yielded the greatest win rate. In fact, these runes averaged a 50.5% winrate overall.
By default, tips, statistics, and builds on how to beat Illaoi as Karthus are given for every ranked division. If you want to narrow the statistics and builds to a distinct skill level, you can use the selection menu above.