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 Karthus Yuumi synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Yuumi, 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 large worsening in his KDA (ratio of kills and assists to deaths) when paired with Yuumi. His KDA went down from NaN to NaN. This worsening shows that Yuumi helps Karthus perform poorer in ranked League of Legends matches. Yet, the small difference indicates that this performance change is not very impactful.
When Karthus is an ally to Yuumi, he gets a small decrease in his full damage output. This change may demonstrate that Yuumi does not support by providing cover for him to dish out more damage or that her participation also helps extend the game's duration. Similarly, when Karthus is played alongside Yuumi 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 synergisticly with Yuumi.
Additionally, when Karthus plays with Yuumi on the same team, he typically receives a little less damage than when he plays alone. Receiving not as much damage may mean that Yuumi does a decent job of covering Karthus during team fights.
There is no one best synergy for Karthus that will no matter what be his #1 ally. Yet, overall, Yuumi is a very bad ally for Karthus. By locking into the same team as Karthus, she lowers their win rate by -7.2% to 40.1%. This proves that there is a very bad bond between Karthus and Yuumi that results in them performing worse together than alone.
Yuumi has a much lower diffuclty than Karthus. That means you don't need to be very careful when enlisting Yuumi comrades to play with, as they will need a much lower level of skill to be able to cooperate well with you.
Fighting cooperatively, you will likely observe an overall large increase in your team’s ability to to do a lot of AP damage. Together, these champs are able to dish out a surprising amount of magic type damage.
Although, by grouping Karthus and Yuumi together, you will not be providing your side a great deal of protection for burst damage. We recommend you bring other champions on your team that fills this gap in this pairing's capabilities.
Regardless of the ability of your Yuumi teammate, you should focus on maximizing your gold income, outlasting your enemies, and clearing objectives. If you heed this simple advice, you should do well, regardless.
If you would like to learn all of the intricacies of Karthus to work well with Yuumi during both the lane and mid / late game phases of LoL games, you should continue reading to master additional tricks and insights into this champion pairing. If you mind the build and stats shown above, you should increase your win rate significantly.
The top items to build first in your Karthus and Yuumi synergy build consist of Malignance, Stormsurge, and Liandry's Torment. When Karthus included at least these three finished items in his build, he did a lot better as an ally of Yuumi than with most other common builds. In fact, Karthus had an average winrate of 40.1% when playing alongside Yuumi with this build.
To have the best chance of crushing your oponents, Karthus players should take 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 rune combinations that we analyzed for this champion pairing, this mixture of runes yielded the highest win rate. In fact, these runes gave a 40.1% win rate overall.
If you want to get Karthus with Yuumi synergy tips and builds for a a distinct player tier, feel free to select one from the selection menu provided above. At first, the stats and strategies shown are calculated using all matches finished with both champions.