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.
Katarina's abilities deal magic damage, so even if she's building Attack Damage items, get magic resistance to counter her.
Try to save a disable for when Katarina uses her Death Lotus.
The stats shown on this page show some influential Karthus against Katarina matchup statistics that can help you explain the differences and similarities between this set of champs. For instance, Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is better than Katarina’s KDA ratio of NaN, highlighting that Karthus may be more central to his team's team fighting capacity than Katarina..
Karthus often has a significantly smaller longest kill spree than his foe does. Typically, he receives a similar amount of damage to Katarina. This is usually reflective of different amounts of tankyness; however, it can also illustrate that the one champ has less mobility and thus is not able to kite away from further damage when engaged or poked.
Both League champions are great champions. Both have their strengths, weaknesses, and counters. In the game's current meta, Karthus usually loses when taking on Katarina, with a 48.2% win rate. Thus, Karthus makes a bad counter to Katarina.
While Karthus does have a lower win rate compared to Katarina, when on opposite teams, Karthus also has a lower level of difficulty that makes him a less challenging character to pick up and master. You still need to be cautious when picking Karthus into Katarinaas 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 Katarina. This often makes her just as valuable during teamfights, especially when facing champions with a ton of burst damage.
While there isn't a single best champion overall in League of Legends, in Karthus vs Katarina matchups, Katarina is the better champ with a lower win rate, less champion complexity, and a similar amount of utility to help out your teammates during teamfights.
Karthus is a somewhat poor counter to Katarina. You will do well by focussing your actions on maximizing your CS and taking out objectives. If you are able to do that, you should be able to stand on your own as Karthus against Katarina.
To learn all of the intricacies of Karthus to counter Katarina during both the laning and mid / late game phases of League of Legends, you should keep reading to learn a few extra tricks and insights into this matchup. If you mind the build and suggestions displayed here, you should grow your win rate significantly and be closer to League of Legends pro players.
Karthus typically accumulates less CS relative to Katarina. Champions who on average don't earn many minion kills typically don't require much CS to be valuable teammates, such as support champions. These kinds of champions are able to scale well off of their skills, stats, and first items alone. Yet, champions with a lot of CS, such as hyper-carries, usually need several high cost items to be effective. In either situation, try to do better than the numbers displayed here to do well.
The most crucial items to have in your Karthus versus Katarina build include Rabadon's Deathcap, Shadowflame, and Liandry's Torment. When Karthus included at least these three items in his build, he did much better countering Katarina than with many other typical item sets. In fact, Karthus boasted an average win rate of 48.2% when playing against Katarina with this build.
To have the highest probability of vanquishing Katarina as Karthus, you should equip 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 rune combinations players picked for Karthus vs Katarina counters, this blending of runes resulted in the best win rate. Notably, these runes provided a 48.2% win rate overall.
If you want to see Karthus x Katarina tips and matchup stats and build suggestions for a a distinct player tier, feel free to select one from the selection menu displayed above. At first, the stats and strategies shown are calculated using every round finished with these champions.