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.
Despair is very effective against other tanks, so make sure you're in range of opponents with the highest Health.
Amumu is highly dependent on teammates, so try laning with your friends for maximum effectiveness.
Cooldown Reduction on Amumu is very strong, but it's often difficult to itemize for it. Grab the Golem buff whenever possible to gain Cooldown Reduction without sacrificing stats.
The Karthus Amumu synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Amumu, 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 Amumu. His KDA fell from NaN to NaN. This negative change shows that Amumu helps Karthus perform poorer in ranked League of Legends rounds. Yet, the small difference demonstrates that this performance change is only marginal.
When Karthus is paired with Amumu, he observes a noticable increase in his complete damage output. This change may indicate that Amumu supports by providing cover for him to deal more damage or that his support also helps extend the round's duration. Similarly, when Karthus is played with Amumu on the same side, he usually scores many fewer killing sprees than when he plays alone. This is contrasting evidence that he is worse when playing with Amumu.
Moreover, when Karthus plays with Amumu on the same side, he often takes much less damage than when he fights alone. Getting dealt not as much damage may mean that Amumu does a decent job of covering Karthus in teamfights.
There is no one best ally for Karthus that will no matter what be his top synergy. However, Amumu is a very typical companion for Karthus. By playing on the same team as Karthus, he lowers their win rate by -0.3% to 47.0%. This shows that there is only a small strategic relationship between Karthus and Amumu that allows them to perform worse together than without each other.
Amumu has a much lower diffuclty than Karthus. That means you don't need to be very careful when finding Amumu teammates to go into battle on the same side as, as they will need a much lower level of skill to be able to play well with you.
Playing cooperatively, Karthus players should expect to observe an overall large increase in your team’s capability to deal magic damage. Combined, these champions can deal quite a lot of AP type damage.
Conversely, by bringing Karthus and Amumu together, you probably will not be granting your team enough AD. We recommend you pick other champs on your team that fills this relative gap in their abilities.
Regardless of your Amumu ally's ability, you should focus on increasing your income, staying alive by avoiding foolish fights, and clearing objectives. If you follow these simple suggestions, you will do well, regardless.
If you would like to truly master Karthus in order to synergize with Amumu during both the laning and mid / late game phases of LoL games, you should continue reading to gather a few extra tips and tricks for this champion pairing. If you pay attention to the build and suggestions shown here, you will increase your win rate significantly.
The ideal items to include in your Karthus and Amumu synergy build consist of Rabadon's Deathcap, Shadowflame, and Liandry's Torment. When Karthus used at least these three great items in his build, he did much better when fighting alongside Amumu than with many other typical item sets. In fact, Karthus boasted an average win rate of 47.0% when synergizing his build and playstyle to Amumu with this build.
To have the greatest chance of vanquishing your oponents, you should use the Dark Harvest, Cheap Shot, Eyeball Collection, Ultimate Hunter, Presence of Mind, and Last Stand runes from the Domination and Precision rune sets. Out of all the rune sets players picked for this champion pairing, this set of runes resulted in the greatest win rate. Notably, these runes gave a 47.0% win rate overall.
By default, tips, stats, and builds on how to synergize Amumu with Karthus are displayed for all skill levels, merged. To scope the statistics and builds to a specific skill level, you can use the selection menu above.