Ask your allies to help point out when you should use Requiem to get kills in different lanes.
Lay Waste is very strong at farming minions and harassing enemy champions.
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 clarify several significant Karthus vs. Katarina matchup statistics that may help us grasp the distinctions between this set of champions. As an example, Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Katarina’s ratio of NaN, demonstrating that Karthus may be more central to his team's team fighting potential than Katarina..
Karthus normally has a slightly smaller longest kill spree than his enemy does. On average, he receives a similar amount of damage to Katarina. This is usually reflective of differing health capacities; however, it can also indicate that the champion with increased health has less agility and thus is unable to escape additional damage when engaged or poked.
Both League of Legends champions are great champions. Both have their strengths, weaknesses, and counters. In the game's current meta, Karthus usually fairs equally well when trying to fight Katarina, with a 49.4% win rate. Therefore, Karthus makes an ok counter for Katarina.
While Karthus does have a lower win rate than Katarina, when they face off with one another, Karthus also has a lower level of difficulty that makes him a less complex champion to pick up and master. You should be careful when picking Karthus into Katarinaas his relative depth means you may not be able to reach his full potential without a lot of practice beforehand.
Additionally, Karthus has some amount of utility and CC, a similar amount to Katarina. This makes her just as valuable during team fights, especially when facing champions with a ton of burst damage.
While there is not one best champion in League of Legends, in Karthus vs Katarina matchups, Katarina is the better champ with a similar win rate, less champion complexity, and a similar amount of utility to help out your teammates during team fights.
Karthus is a somewhat poor counter to Katarina. Focus your strategy on keeping up your gold and cs and clearing objectives. If you are able to do that, you should hold your own as Karthus against Katarina.
To learn all of the intricacies of Karthus to counter Katarina during both the early game and mid / late game phases of League of Legends, you should keep reading to pick up a few extra tricks and insights into this matchup. If you pay attention to the build and tips presented here, you will grow your win rate by a lot and be that much closer to League of Legends pro players.
Karthus most often picks up less CS as Katarina. Champs who on average don't earn many minion kills typically don't need much CS to be valuable teammates, such as supports. These kinds of champions are able to scale well off of their abilities and first items alone. Yet, champions with a lot of CS, such as hyper-carries, usually need many items to be effective. In either case, try to surpass the numbers shown here to do well.
The most crucial items to focus on in your Karthus versus Katarina build include Liandry's Anguish, Rabadon's Deathcap, and Void Staff. When Karthus bought at least these three pieces in his build, he did a lot better when fighting Katarina than with most other typical counter builds. In fact, Karthus had an average winrate of 49.4% battling Katarina with this build.
To have the best likelihood of vanquishing Katarina as Karthus, you should use the Dark Harvest, Taste of Blood, Eyeball Collection, Ultimate Hunter, Presence of Mind, and Last Stand runes from the Domination and Precision rune sets. Of all the rune builds players picked for Karthus vs Katarina counters, this mix of runes resulted in the highest win rate. In fact, these runes provided a 49.4% win rate overall.
By default, tips, stats, and builds on how to beat Katarina as Karthus are shown for all skill levels, merged. If you want to scope the stats and builds to a particular skill level, you should use the selection menu located above.