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.
Make sure to tag your allies while Sona's auras are active, but avoid getting caught out by enemies.
Save Crescendo for the game-altering moment.
Well-timed uses of Aria of Perseverance will grant you maximum survivability.
The Karthus Sona synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Sona, 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 Sona. His KDA fell from NaN to NaN. This fall shows that Sona helps Karthus perform poorer in competitive League of Legends matches. Yet, the small difference indicates that this performance change is not very impactful.
When Karthus is paired with Sona, he gets a barely noticable drop in his total damage output. This could signal that Sona doesn't help protection for him to dish out more damage or that her allyship also helps extend the round's duration. Similarly, when Karthus is played together with Sona 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 Sona.
Additionally, when Karthus plays with Sona on the same team, he on average receives a little less damage than when he plays alone. Getting dealt not as much damage could indicate that Sona does a decent job of covering Karthus in team fights.
There is no universally accepted best champion pairing for Karthus that will always be his #1 ally. However, Sona is a not very good ally for Karthus. By playing on the same side as Karthus, she decreases their win rate by -2.2% to 45.1%. This demonstrates that there is a negative strategic relationship between Karthus and Sona that allows them to perform worse together than without each other.
Sona has a much lower diffuclty than Karthus. That means Karthus players don't need to be cautious when finding Sona allies to play with, as they will need a much lower level of skill to cooperate well with you.
When playing cooperatively, you should witness an overall large increase in your team’s ability to to do a lot of AP damage. When paired, these champs are able to dish out a surprising amount of magic type damage.
Although, by aligning Karthus and Sona together, you may not be giving your other teammates much protection for burst damage. Plan to have other champions on your team that nullifies this gap in this pairing's playstyle.
Regardless of the ability of your Sona ally, you need to focus on maximizing your gold income, outlasting your enemies, and taking down objectives. If you heed this simple advice, you should do well anyway.
To learn all of the intricacies of Karthus to work well with Sona during both the lane and mid / late game phases of League of Legends games, you should continue reading to learn a few extra lessons on this champion pairing. If you listen to the build and tips presented above, you will increase your win rate significantly.
The most crucial items to prioritize in your Karthus and Sona synergy build consist of Malignance, Stormsurge, and Liandry's Torment. When Karthus bought at least these three items in his build, he did significantly better as an ally of Sona than with many other typical item sets. In fact, Karthus boasted an average winrate of 45.1% helping carry Sona with these items in his kit.
To have the best probability of defeating your oponents, Karthus players should take the Dark Harvest, Cheap Shot, Eyeball Collection, Ultimate Hunter, Gathering Storm, and Transcendence runes from the Domination and Sorcery rune sets. Out of all the rune sets players chose for this team composition, this combo of runes yielded the greatest win rate. Notably, these runes averaged a 45.1% win rate overall.
By default, tips, statistics, and builds on how to team up Sona with Karthus are displayed for all ranked divisions combined. If you would like to narrow the statistics and builds to an individual rank, you may use the selection menu earlier on the page.