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.
If you stun an enemy with Shocking Orb, follow up with a guaranteed center hit on Eye of Destruction.
It's easier to land Arcanopulse on an enemy when they're moving toward or away from you, rather than side to side.
Eye of Destruction will make landing Arcanopulse easier as the target will be slowed.
The Karthus Xerath synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Xerath, 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 Xerath. His KDA decreased from NaN to NaN. This drop shows that Xerath helps Karthus perform worse in competitive League of Legends matches. Yet, the small difference proves that this performance change is not very impactful.
When Karthus is paired with Xerath, he sees a marginal improvement in his full damage output. This difference could demonstrate that Xerath helps provide cover for him to dish out more damage or that his presence also helps increase the round's duration. Similarly, when Karthus is played together with Xerath on the same side, he usually scores many fewer killing sprees compared to when he plays without Xerath. This is contrasting evidence that he is worse when playing with Xerath.
Additionally, when Karthus plays with Xerath on the same team, he on average receives more damage than when he plays alone. Getting dealt more damage could mean that Xerath does a poor job of covering Karthus in team fights.
There is no one best champion pairing for Karthus that will no matter what be his ideal ally. However, overall, Xerath is a good ally for Karthus. By playing on the same side as Karthus, he increases their win rate by 1.0% to 48.3%. This shows that there is a somewhat important bond between Karthus and Xerath that results in them performing stronger together than alone.
Xerath has a greater difficulty than Karthus. That means Karthus players need to be careful when lining up Xerath teammates to go into battle on the same side as, as they will have to have a greater level of skill to be able to play well with you.
Fighting cooperatively, you should see an overall large increase in your team’s ability to deal magical damage. When paired, these two can deal quite a lot of AP type damage.
Conversely, by bringing Karthus and Xerath together, you may not be giving your team much sustained damage output. We recommend you have other champs on your team that helps cover this relative gap in their kit.
Regardless of the skill of your Xerath teammate, you need to focus on increasing your gold income, warding to avoid ambushes, and clearing objectives. If you follow these simple suggestions, you should do well anyway.
If you would like to learn all of the intricacies of Karthus to work well with Xerath during both the early game and mid / late game phases of League rounds, you should keep reading to learn additional tips and tricks for this champion pairing. If you mind the build and suggestions shown above, you should increase your win rate significantly.
The most important finished items to prioritize in your Karthus and Xerath synergy build include Rabadon's Deathcap, Void Staff, and Liandry's Torment. When Karthus included at least these three finished items in his build, he performed much better as an ally of Xerath than with most other common item sets. In fact, Karthus had an average winrate of 48.3% when synergizing his build and playstyle to Xerath with these items in his kit.
To have the best chance of coming out on top against your oponents, Karthus players should equip the Dark Harvest, Cheap Shot, Eyeball Collection, Ultimate Hunter, Gathering Storm, and Transcendence runes from the Domination and Sorcery rune sets. Out of all the rune builds players used for Karthus and Xerath pairings, this composite of runes yielded the best win rate. In fact, these runes gave a 48.3% win rate overall.
If you would like to get Karthus with Xerath collaboration tips and builds for a an individual division, please select one from the selection menu displayed above. At first, the stats and build suggestions given are computed using all matches finished with both champs.