Defiant Dance is not interrupted by crowd control, try timing it for incoming disables.
Flawless Duet does not have a maximum travel distance, try using it in creative ways.
Use Bladesurge to cover great distances by targeting low life minions on your way to champion targets.
Karthus can cast spells for a short duration after he is killed. Move away from his corpse to be safe.
Make sure you always have enough health to survive Requiem, even if you have to go back to the base more frequently to heal.
The stat comparisons shown here feature some strategic Irelia versus Karthus counter stats that can help you understand the differences and similarities between this set of champions. As an example, Irelia’s KDA ratio ([kills + assists] / deaths) of NaN is more than Karthus’s KDA ratio of NaN, showing that Irelia may be more central to her team's team fighting capacity than Karthus..
Irelia often has a similar longest kill spree as her opponent does. Commonly, she takes more damage than Karthus. This often reflects different amounts of tankyness, but it can also show that the one champ has less mobility and thus is unable to flee from further damage when engaged or poked.
Both League of Legends champions are great. Both have their strengths, weaknesses, and counters. In League's current meta, Irelia usually wins when playing against Karthus, with a 52.5% win rate. As a result, Irelia makes a good counter for Karthus.
While Irelia does have a higher win rate than Karthus, when they face off with one another, Irelia also has a lower level of difficulty that makes her a less challenging champ to pick up and master. You should be be fine when picking Irelia into Karthus.
Moreover, Irelia also has some amount of utility and CC, a similar amount to Karthus. This often makes her just as valuable during teamfights, especially when fighting champions with a lot of burst damage.
While there is not one best champion for every situation in League of Legends, in Irelia vs Karthus matchups, Irelia is the better champ with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your teammates during late stage team fights.
Irelia is an above average counter to Karthus. You will do well by focussing your strategy on increasing your CS and clearing objectives. If you can do that, you should be able to stand on your own as Irelia against Karthus.
If you would like to truly master Irelia in order to counter Karthus during both the laning and mid / late game phases of League of Legends, you should keep reading to gather a few extra lessons on this matchup. If you mind the build and suggestions shown here, you will grow your win rate significantly and be that much closer to League of Legends pro players.
Irelia on average accumulates more CS relative to Karthus. Champions who typically don't earn much CS often don't need much CS to be valuable teammates, such as sup champs. They 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, often have to have many items to be effective. In either case, try to exceed the numbers reported on this page to do well.
The ideal items to use in your Irelia versus Karthus build consist of Wit's End, Blade of The Ruined King, and Terminus. When Irelia combined at least these three items in her build, she performed a lot better versus Karthus than with most other typical item sets. In fact, Irelia had an average winrate of 52.5% when countering Karthus with this counter build.
To have the greatest likelihood of beating Karthus as Irelia, you should take the Conqueror, Triumph, Legend: Alacrity, Last Stand, Biscuit Delivery, and Cosmic Insight runes from the Precision and Inspiration rune sets. Of all the runes that we analyzed for Irelia vs Karthus battles, this sequence of runes yielded the best win rate. In fact, these runes provided a 52.5% win rate overall.
By default, tips, stats, and builds on how to beat Karthus as Irelia are displayed for all skill levels combined. If you would like to narrow the stats and builds to an individual player tier, you can use the selection menu above.