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 Kayn is in terrain near you, you will get a visual warning on the edge of the terrain he's in.
Umbral Trespass requires Kayn to damage a target first. Try to dodge Blade's Reach to deny him a long range cast of Umbral Trespass.
Damage Kayn while he's in Shadow Step to shorten its duration, or apply hard crowd control (stun, charm, knockup, etc) to end Shadow Step immediately.
The stat comparisons shown here clarify some critical Karthus vs. Kayn matchup stats that may help us figure out the differences and similarities between the pair. Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is more than Kayn’s ratio of NaN, showing that Karthus may be more central to his team's team fighting effectiveness than Kayn..
Karthus usually has a similar longest killing spree as his enemy does. On average, he receives less damage than Kayn. This commonly reflects different amounts of tankyness, yet it can also hint that the champ with more HP has less mobility and thus is not able to kite away from further harm when poked or engaged.
Both League champs are great champions. Both have their pros and cons. In the game's current meta, Karthus usually loses when trying to fight Kayn, with a 47.7% win rate. As a result, Karthus makes a poor counter to Kayn.
While Karthus does have a lower winrate compared to Kayn, when facing one another, Karthus also has a lower level of difficulty that makes him a less challenging character to develop with. You should expect to face a difficult match when picking Karthus into Kaynas his relative depth means that you may not be able to unleash his full potential without a significant amount of practice beforehand.
Furthermore, Karthus has some amount of utility and CC, a similar amount to Kayn. This often makes her just as valuable during team fights, especially when fighting champions with a lot of burst damage.
While there is not a single best champion in League of Legends, in Karthus vs Kayn matchups, Kayn is the better champ with a lower win rate, less champion complexity, and a similar amount of utility to help out your team members during teamfights.
Karthus is a bad counter to Kayn. Focus your tactics on increasing your CS and taking out objectives. If you do that, you should be able to stand on your own as Karthus against Kayn.
If you would like to learn all of the intricacies of Karthus in order to counter Kayn during both the early game and mid / late game phases of League of Legends, you should continue reading to pick up a few extra tricks and insights into this matchup. If you listen to the build and tips presented above, you will grow your win rate by a lot and be that much closer to League of Legends pro players.
Karthus often gets more CS compared to Kayn. Champions who on average don't acquire much CS typically don't need much CS to be effective, such as supports. They are capable of scaling well off of their skills, stats, and first items alone. Yet, champs with a lot of CS, such as hyper-carries, typically require a lot of items to be effective. In either case, try to surpass the numbers shown here to do well.
The top items to prioritize in your Karthus versus Kayn build consist of Rabadon's Deathcap, Shadowflame, and Liandry's Torment. When Karthus used at least these three items in his build, he performed a lot better vs. Kayn than with most other typical builds. In fact, Karthus had an average win rate of 47.7% when playing against Kayn with this build.
To have the best probability of crushing Kayn as Karthus, you should take the Dark Harvest, Cheap Shot, Eyeball Collection, Ultimate Hunter, Gathering Storm, and Transcendence runes from the Domination and Sorcery rune sets. Out of all the runes that we analyzed for Karthus vs Kayn clashes, this mixture of runes yielded the greatest win rate. In fact, these runes gave a 47.7% winrate overall.
If you would like to see Karthus versus Kayn tips and matchup stats and build suggestions for a a specific rank, please choose one from the selection menu provided above. At first, the stats and guides displayed are calculated using every round with data with these champs.