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.
Sivir's Boomerang Blade returns to her after reaching the max range, so you can shift position to hit enemies who would otherwise have evaded it.
Try saving Spell Shield for enemy abilities that can disable you such as stuns and roots.
Ricochet resets Sivir's basic attack timer on activation, so activating this immediately after landing a normal basic attack will maximize damage output.
The Karthus Sivir synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Sivir, 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 Sivir. His KDA fell from NaN to NaN. This fall shows that Sivir helps Karthus perform poorer in competitive League of Legends games. Yet, the small difference demonstrates that this performance change is only marginal.
When Karthus tries to synergize with Sivir, he observes a small increase in his full damage dealt. This could demonstrate that Sivir provides protection for him to deal more damage or that her presence on the team also helps increase the match's duration. Similarly, when Karthus is played alongside Sivir 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 with Sivir.
Moreover, when Karthus plays with Sivir on the same team, he often takes more damage than when he fights alone. Getting dealt more damage could mean that Sivir does a poor job of protecting Karthus during teamfights.
There is no perfect synergy for Karthus that will 100% of the time be his ideal teammate. However, Sivir is a very bad ally for Karthus. By playing on the same team as Karthus, she lowers their win rate by -4.6% to 42.7%. This signals that there is a terrible bond between Karthus and Sivir that results in them performing worse together than without each other.
Sivir has a much lower diffuclty than Karthus. That means Karthus players don't need to be careful when enlisting Sivir teammates to fight alongside, as they will have to have a much lower level of skill to play well with you.
Playing alongside, Karthus players will likely see an overall large increase in your team’s ability to dish out massive AD. Together, these champions can tear through the other team with a lot of physcial damage.
Conversely, by bringing Karthus and Sivir together, you will not be providing your other teammates much engage potential. Plan to have other champions on your team that helps cover this hole in their kit.
Regardless of your Sivir ally's ability, you should focus on maximizing your income, warding to avoid ambushes, and clearing objectives. If you do this, you should do well, regardless.
If you would like to truly master Karthus to work well with Sivir during both the lane and mid / late game phases of League games, you should continue reading to master additional lessons on this champion pairing. If you pay attention to the build and stats presented above, you will grow your win rate significantly.
The best items to get in your Karthus and Sivir synergy build include Rabadon's Deathcap, Malignance, and Shadowflame. When Karthus combined at least these three pieces in his build, he performed a lot better as an ally of Sivir than with many other common item sets. In fact, Karthus boasted an average win rate of 42.7% when playing alongside Sivir with this build.
To have the highest likelihood of crushing your oponents, you should use the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Eyeball Collection, and Ultimate Hunter runes from the Inspiration and Domination rune sets. Of all the rune sets players chose for Karthus and Sivir pairings, this set of runes resulted in the top win rate. In fact, these runes provided a 42.7% win rate overall.
If you would like to view Karthus with Sivir cooperations tips and stats for a an individual division rank, please select one from the selection menu displayed above. At first, the statistics and tips and suggestions shown are computed using every round played with these champions.