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 Fiddlesticks synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Fiddlesticks, 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 Fiddlesticks. His KDA decreased from NaN to NaN. This decrease shows that Fiddlesticks helps Karthus perform worse in competitive League of Legends matches. Yet, the small difference shows that this performance change is only marginal.
When Karthus plays on the same team as Fiddlesticks, he gets a little drop in his full damage output. This could signal that Fiddlesticks does not provide protection for him to deal more damage or that his allyship also helps extend the game's duration. Similarly, when Karthus is played together with Fiddlesticks on the same team, he usually scores many fewer killing sprees compared to when he plays without Fiddlesticks. This is contrasting evidence that he is worse when playing synergisticly with Fiddlesticks.
Additionally, when Karthus plays with Fiddlesticks on the same team, he often receives much less damage than when he fights alone. Taking not as much damage could mean that Fiddlesticks does a decent job of protecting Karthus in teamfights.
There is no one best ally for Karthus that will always be his top teammate. Yet, Fiddlesticks is a terrible companion for Karthus. By playing on the same team as Karthus, he lowers their win rate by -6.0% to 41.3%. This proves that there is an easy to overcome and exploit bond between Karthus and Fiddlesticks that allows them to perform not as well together than alone.
Fiddlesticks has a greater difficulty than Karthus. That means you should be careful when enlisting Fiddlesticks comrades to play with, as they will require a greater level of skill to be able to fight well with you.
Playing alongside, Karthus players should see an overall large increase in your team’s ability to deal magic damage. When paired, these champions can blast through enemies with magic damage.
Although, by pairing Karthus and Fiddlesticks together, you will not be providing your other teammates enough anti-tank damage dealing potential. Make sure to pick other champs on your team that fills this gap in this pairing's kit.
Regardless of your Fiddlesticks ally's skill level, you should focus on maximizing your income, warding to avoid ambushes, and clearing objectives. If you heed this simple advice, you will do well anyway.
To learn all of the intricacies of Karthus to work well with Fiddlesticks during both the lane and mid / late game phases of League of Legends matches, you should keep reading to gather additional tricks and insights into this champion pairing. If you listen to the build and suggestions presented here, you should increase your win rate by a lot.
The most crucial items to have in your Karthus and Fiddlesticks synergy build include Malignance, Shadowflame, and Liandry's Torment. When Karthus incorporated at least these three pieces in his build, he did much better when fighting alongside Fiddlesticks than with most other common item sets. In fact, Karthus boasted an average winrate of 41.3% when playing alongside Fiddlesticks with these items in his kit.
To have the greatest chance of coming out on top against 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. Of all the rune sets that we analyzed for this team composition, this set of runes yielded the highest win rate. Notably, these runes averaged a 41.3% winrate overall.
If you want to view Karthus with Fiddlesticks cooperations tips and builds for a an individual player tier, feel free to choose one from the selection menu above. If viewing for the first time, the statistics and build suggestions given are calculated using every game finished with both champs.