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.
Shield of Daybreak and Zenith Blade form a powerful offensive combo.
Lead the charge and mark your foes with Sunlight before your allies deal damage.
You can absorb a huge amount of damage using Eclipse, but you must stay near enemies to gain the bonus duration.
The Karthus Leona synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Leona, 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 Leona. His KDA decreased from NaN to NaN. This fall shows that Leona helps Karthus perform poorer in ranked League of Legends games. Yet, the small difference shows that this performance change is not very impactful.
When Karthus plays on the same team as Leona, he sees a marginal improvement in his full damage output. This difference may indicate that Leona provides protection for him to deal more damage or that her presence also helps extend the game's duration. Similarly, when Karthus is played alongside Leona on the same team, he usually scores many fewer killing sprees compared to when he plays on his own. This is contrasting evidence that he is worse when playing alongside Leona.
Additionally, when Karthus plays with Leona on the same team, he on average takes a little less damage than when he fights alone. Taking not as much damage may mean that Leona does a decent job of covering Karthus in teamfights.
There is no top champion pairing for Karthus that will no matter what be his best ally. However, overall, Leona is a top-tier teammate for Karthus. By being on the same team as Karthus, she raises their win rate by 4.1% to 51.4%. This proves that there is an important bond between Karthus and Leona that allows them to perform stronger together than without each other.
Leona has a much lower diffuclty than Karthus. That means you don't need to be careful when arranging Leona allies to play with, as they will require a much lower level of skill to be able to play well with you.
Fighting together, Karthus players should observe an overall large increase in your team’s ability to support your allies. Together, these champions may be able to carry with the power of their abilities.
In contrast, by pairing Karthus and Leona together, you may not be giving your other teammates a lot of sustained damage output. We recommend you bring other champions on your team that helps cover this hole in this pairing's abilities.
Regardless of your Leona ally's skill level, you should focus on maximizing your income, warding to avoid ambushes, 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 to pair well with Leona during both the laning and mid / late game phases of League of Legends games, you should continue reading to pick up some more tips and tricks for this champion pairing. If you listen to the build and tips displayed above, you should grow your win rate by a lot.
The best finished items to focus on in your Karthus and Leona synergy build consist of Rabadon's Deathcap, Malignance, and Stormsurge. When Karthus combined at least these three great items in his build, he performed much better when fighting alongside Leona than with many other common builds. In fact, Karthus boasted an average win rate of 51.4% when playing alongside Leona with these items in his kit.
To have the best chance of defeating your oponents, you 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. Out of all the runes players picked for Karthus and Leona pairings, this set of runes yielded the top win rate. Notably, these runes gave a 51.4% win rate overall.
By default, tips, statistics, and builds on how to pair Leona with Karthus are displayed for every ranked division. If you want to filter the statistics and builds to a specific rank, you should use the selection menu above.