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.
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.
The Irelia Karthus synergy stats shown here demonstrate the areas of her gameplay that do better (or worse) when paired with Karthus, compared to her overall stats. Significant differences are areas of focus that highlight how her gameplay changes when paired with this other champion.
Overall, Irelia sees a large worsening in her KDA (ratio of kills and assists to deaths) when paired with Karthus. His KDA went down from NaN to NaN. This fall shows that Karthus helps Irelia perform worse in ranked League rounds. Yet, the small difference proves that this performance change is only marginal.
When Irelia is an ally to Karthus, she gets a little increase in her total damage dealt. This change could signal that Karthus helps provide protection for her to deal more damage or that his presence also helps extend the match's duration. Similarly, when Irelia is played with Karthus on the same team, he usually scores many fewer killing sprees than when she plays on his own. This is contrasting evidence that she is worse when playing alongside Karthus.
Additionally, when Irelia plays with Karthus on the same team, she typically receives a little more damage than when she plays alone. Getting dealt more damage could mean that Karthus does a poor job of covering Irelia in team fights.
There is no ideal synergy for Irelia that will always be her ideal teammate. However, overall, Karthus is a very typical companion for Irelia. By playing on the same team as Irelia, he lowers their win rate by -0.8% to 49.0%. This clearly indicates that there is only a small bond between Irelia and Karthus that results in them performing worse together than without each other.
Karthus has a greater difficulty than Irelia. That means Irelia players should be cautious when enlisting Karthus allies to fight alongside, as they will need a greater level of skill to do well with you.
Fighting on the same side, you will likely see an overall large increase in your team’s capacity to to do a lot of AP damage. When paired, these champions are able to dish out a surprising amount of magic type damage.
In contrast, by grouping Irelia and Karthus together, you probably will not be giving your other teammates a lot of tankyness. Make sure to have other champs on your team that nullifies this relative hole in their potential.
Regardless of the ability of your Karthus teammate, you need to focus on increasing your gold income, outlasting your enemies, and taking down objectives. If you heed this simple advice, you will do well, regardless.
If you would like to learn all of the intricacies of Irelia to work well with Karthus during both the early game and mid / late game phases of LoL matches, you should continue reading to pick up some more tricks and insights into this champion pairing. If you mind the build and suggestions shown here, you will increase your win rate significantly.
The best items to have in your Irelia and Karthus synergy build consist of Sterak's Gage, Experimental Hexplate, and Blade of The Ruined King. When Irelia incorporated at least these three pieces in her build, she performed significantly better when fighting alongside Karthus than with many other common item sets. In fact, Irelia had an average winrate of 49.0% helping carry Karthus with this build.
To have the highest chance of beating your oponents, Irelia players should equip the Conqueror, Triumph, Legend: Alacrity, Last Stand, Bone Plating, and Unflinching runes from the Precision and Resolve rune sets. Out of all the rune builds players used for this champion pairing, this mixture of runes resulted in the greatest win rate. In fact, these runes gave a 49.0% winrate overall.
By default, tips, statistics, and builds on how to synergize Karthus with Irelia are shown for all skill levels, merged. If you want to scope the statistics and builds to a distinct skill level, you may use the selection menu earlier in the counter matchup guide.