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.
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 Xerath Karthus synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Karthus, compared to his overall stats. Significant differences are areas of focus that highlight how his gameplay changes when paired with this other champion.
Overall, Xerath sees a large worsening in his KDA (ratio of kills and assists to deaths) when paired with Karthus. His KDA went down from NaN to NaN. This decrease shows that Karthus helps Xerath perform worse in competitive League of Legends matches. Yet, the small difference shows that this performance change is only marginal.
When Xerath is paired with Karthus, he sees a small increase in his complete damage dealt. This change could indicate that Karthus helps provide protection for him to deal more damage or that his support also helps extend the game's duration. Similarly, when Xerath is played together with Karthus on the same side, he usually scores many fewer killing sprees than when he plays without Karthus. This is contrasting evidence that he is worse when playing synergisticly with Karthus.
Moreover, when Xerath plays with Karthus on the same side, he typically takes more damage than when he fights alone. Taking more damage could indicate that Karthus does a poor job of covering Xerath in teamfights.
There is no top champion pairing for Xerath that will no matter what be his ideal ally. Yet, overall, Karthus is a below average companion for Xerath. By playing on the same side as Xerath, he drops their win rate by -2.3% to 48.3%. This proves that there is a bad bond between Xerath and Karthus that allows them to perform worse together than alone.
Karthus has a lower difficulty than Xerath. That means Xerath players don't need to be careful when enlisting Karthus comrades to play with, as they will have to have a relatively low level of skill to be able to work well with you.
When playing together, you should expect to see an overall large increase in your team’s capability to deal magic damage. Together, these champions are able to dish out a surprising amount of magic type damage.
In contrast, by bringing Xerath and Karthus together, you may not be providing your other teammates a great deal of sustained damage output. We recommend you pick other champions on your team that helps cover this relative gap in this pairing's abilities.
Regardless of your Karthus ally's ability, you need to focus on increasing your income, warding to avoid ambushes, and clearing objectives. If you follow these simple suggestions, you should do well anyway.
To truly master Xerath to work well with Karthus during both the lane and mid / late game phases of LoL games, you should continue reading to master some more lessons on this champion pairing. If you mind the build and stats presented here, you will grow your win rate by a lot.
The most important finished items to have in your Xerath and Karthus synergy build consist of Rabadon's Deathcap, Zaz'Zak's Realmspike, and Luden's Companion. When Xerath incorporated at least these three great items in his build, he did a lot better when paired up with Karthus than with most other typical builds. In fact, Xerath boasted an average winrate of 48.3% when synergizing his build and playstyle to Karthus with this build.
To have the best chance of annihilating your oponents, you should take the First Strike, Magical Footwear, Biscuit Delivery, Cosmic Insight, Manaflow Band, and Scorch runes from the Inspiration and Sorcery rune sets. Out of all the rune builds players picked for this champion pairing, this combo of runes resulted in the greatest win rate. Moreover, these runes provided a 48.3% win rate overall.
If you would like to see Xerath and Karthus synergy tips and builds for a a particular division, feel free to choose one from the selection menu above. By default, the stats and strategies given are computed using all rounds finished with both champs.