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.
Using Distortion can help your positioning to land Ethereal Chains.
You can chain Sigil of Malice and Ethereal Chains to prevent characters with blink from escaping for up to 4 seconds.
Distortion allows you to be aggressive with your other spells while being able to return to safety.
The Karthus LeBlanc synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with LeBlanc, compared to his overall stats. Significant differences are areas of focus that highlight how his gameplay changes when paired with this other champion.
Overall, Karthus sees a very large drop in his KDA (ratio of kills and assists to deaths) when paired with LeBlanc. His KDA went down from NaN to NaN. This negative change shows that LeBlanc helps Karthus perform poorer in ranked LoL rounds. Yet, the small difference shows that this performance change is only marginal.
When Karthus plays on the same team as LeBlanc, he observes a marginal improvement in his total damage output. This change may signal that LeBlanc provides cover for him to dish out more damage or that her participation also helps increase the match's duration. Similarly, when Karthus is played alongside LeBlanc on the same team, he usually scores many fewer killing sprees than when he plays alone. This is contrasting evidence that he is worse when playing with LeBlanc.
Additionally, when Karthus plays with LeBlanc on the same side, he often receives more damage than when he plays alone. Taking more damage may mean that LeBlanc does a poor job of protecting Karthus during team fights.
There is no universally accepted best champion pairing for Karthus that will 100% of the time be his #1 ally. Yet, LeBlanc is a terrible companion for Karthus. By being on the same side as Karthus, she drops their win rate by -3.5% to 43.8%. This demonstrates that there is an easy to overcome and exploit strategic relationship between Karthus and LeBlanc that results in them performing worse together than alone.
LeBlanc has a greater difficulty than Karthus. That means you must be cautious when arranging LeBlanc allies to play with, as they will need a greater level of skill to be able to work well with you.
Fighting together, you should observe an overall large increase in your team’s capacity to deal magical damage. Combined, these champions are able to dish out a surprising amount of magic type damage.
In contrast, by bringing Karthus and LeBlanc together, you probably will not be providing your side much attack damage. We recommend you have other champs on your team that offsets this gap in this pairing's potential.
Regardless of the skill of your LeBlanc teammate, you should focus on maximizing your income, outlasting your enemies, and clearing objectives. If you follow these simple suggestions, you will do well, regardless.
If you would like to learn all of the intricacies of Karthus in order to pair well with LeBlanc during both the early game and mid / late game phases of LoL rounds, you should continue reading to learn some more tips and tricks for this champion pairing. If you listen to the build and stats presented above, you will increase your win rate by a lot.
The most crucial finished items to focus on in your Karthus and LeBlanc synergy build include Rabadon's Deathcap, Malignance, and Shadowflame. When Karthus used at least these three finished items in his build, he did much better when paired up with LeBlanc than with many other commonly used builds. In fact, Karthus had an average winrate of 43.8% helping carry LeBlanc with these items in his kit.
To have the greatest probability of vanquishing your oponents, Karthus players should equip the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Eyeball Collection, and Ultimate Hunter runes from the Inspiration and Domination rune sets. Of all the runes players used for this team composition, this combo of runes yielded the top win rate. In fact, these runes gave a 43.8% win rate overall.
If you would like to view Karthus with LeBlanc synergy tips and stats for a a particular player tier, feel free to choose one from the selection menu provided above. By default, the statistics and guides given are computed using all matches run with both champions.