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.
Xerath's range can be intimidating, but most champions who close distance with him can trade favorably.
Banshee's Veil will make it much harder for Xerath to land Shocking Orb on you.
Xerath takes a long time to engage Rite of the Arcane. Watch for his spellcast animation and start dodging.
The stats shown on this page emphasize several vital Karthus against Xerath matchup statistics that can help you appreciate the distinctions between the two. Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is more than Xerath’s KDA ratio of NaN, demonstrating that Karthus may be more central to his team's team fighting capacity than Xerath. This observation is largely fueled by the differences in deaths.
Karthus typically has a similar longest kill spree as his matchup does. Commonly, he takes more damage than Xerath. This commonly reflects different amounts of tankyness, yet it can also indicate that the champion with increased HP has less mobility and thus is not able to flee from further harm when engaged or poked.
Both League champions are great champions. Both champs have their pros and cons. In the game's current meta, Karthus usually loses when facing off against Xerath, with a 45.9% win rate. Therefore, Karthus makes a bad counter for Xerath.
While Karthus does have a much lower winrate compared to Xerath, when they face off with one another, Karthus also has a lower level of difficulty that makes him a less difficult character to develop with. You should expect to face a difficult match when picking Karthus into Xerathas his relative depth means you may not be able to unleash his full potential without a lot of practice beforehand.
Moreover, Karthus also has some amount of utility and CC, a similar amount to Xerath. This often makes her just as valuable during team fights, especially when trying to counter champions with a lot of burst damage.
While there isn't a single best champion overall in League of Legends, in Karthus vs Xerath matchups, Xerath is the better champion with a much 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 bad counter for Xerath. Make sure you focus your strategy on maximizing your gold income and taking out objectives. If you do that, you should be able to stand on your own as Karthus against Xerath.
If you would like to learn all of the intricacies of Karthus to counter Xerath during both the lane and mid / late game phases of League of Legends, you should continue reading to pick up a few extra tips and tricks for this matchup. If you mind the build and suggestions displayed above, you will grow your win rate by a lot and be closer to League of Legends pro players.
Karthus typically accumulates a similar amount of CS as Xerath. Champs who typically don't take much CS often don't have to have 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 a lot of CS, such as hyper-carries, often have to have a lot of items to be effective. In either case, try to exceed the values shown here to do well.
The best items to have in your Karthus versus Xerath build consist of Rabadon's Deathcap, Malignance, and Stormsurge. When Karthus combined at least these three items in his build, he did much better countering Xerath than with many other commonly used builds. In fact, Karthus had an average win rate of 45.9% when countering Xerath with this counter build.
To have the highest probability of coming out on top against Xerath 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. Out of all the rune combinations players chose for Karthus vs Xerath counters, this mixture of runes yielded the greatest win rate. Notably, these runes gave a 45.9% winrate overall.
If you want to see Karthus versus Xerath tips and builds for a a particular division rank, feel free to choose one from the selection menu above. At first, the stats and build suggestions given are computed using all rounds finished with these champs.