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.
Impale is extremely powerful when you use it to position an enemy so your allies can attack them.
Basic attacks reduce the cooldown of Crystal Slash. Use them as often as possible for maximum damage.
Capturing Crystal Spires before attempting neutral objectives or team fights around them improves Skarner's performance in said fights dramatically.
The Karthus Skarner synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Skarner, 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 Skarner. His KDA worsened from NaN to NaN. This drop shows that Skarner helps Karthus perform poorer in ranked League of Legends rounds. Yet, the small difference proves that this performance change is not very impactful.
When Karthus plays on the same team as Skarner, he gets a little decrease in his total damage output. This change may indicate that Skarner does not provide cover for him to dish out more damage or that his allyship also helps increase the round's duration. Similarly, when Karthus is played together with Skarner on the same team, he usually scores many fewer killing sprees than when he plays without Skarner. This is contrasting evidence that he is worse when playing with Skarner.
Additionally, when Karthus plays with Skarner on the same team, he on average takes much less damage than when he plays alone. Taking not as much damage could mean that Skarner does a decent job of protecting Karthus in teamfights.
There is no perfect companion for Karthus that will 100% of the time be his top teammate. Yet, overall, Skarner is a very typical companion for Karthus. By being on the same side as Karthus, he lowers their win rate by -0.1% to 47.2%. This clearly indicates that there is not really a strong strategic relationship between Karthus and Skarner that results in them performing worse together than without each other.
Skarner has a lower difficulty than Karthus. That means you don't need to be very careful when arranging Skarner teammates to fight alongside, as they will have to have a lower level of skill to be able to cooperate well with you.
Fighting together, you will likely see an overall large increase in your team’s capacity to deal magic damage. Together, these champs can blast through enemies with magic damage.
Conversely, by bringing Karthus and Skarner together, you probably will not be providing your other allies very much protection for burst damage. Plan to have other champs on your team that neutralizes this hole in their potential.
Regardless of your Skarner ally's skill level, you should focus on maximizing your income, staying alive by avoiding foolish fights, 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 synergize with Skarner during both the laning and mid / late game phases of LoL rounds, you should keep reading to master a few extra tricks and insights into this champion pairing. If you pay attention to the build and tips shown above, you will grow your win rate significantly.
The ideal finished items to include in your Karthus and Skarner synergy build include Rabadon's Deathcap, Cryptbloom, and Shadowflame. When Karthus bought at least these three great items in his build, he did much better when fighting alongside Skarner than with many other typical item sets. In fact, Karthus boasted an average win rate of 47.2% helping carry Skarner with these items in his kit.
To have the highest chance of coming out on top against your oponents, Karthus players should use the Dark Harvest, Cheap Shot, Eyeball Collection, Treasure Hunter, Presence of Mind, and Last Stand runes from the Domination and Precision rune sets. Of all the rune builds that we analyzed for Karthus and Skarner pairings, this sequence of runes resulted in the best win rate. In fact, these runes averaged a 47.2% win rate overall.
By default, tips, stats, and builds on how to team up Skarner with Karthus are displayed for all skill levels combined. If you would like to scope the statistics and builds to a distinct player tier, you can use the selection menu located earlier in the counter matchup guide.