Your most important function as a support is to keep fragile allies safe. Keep Devour's range and cooldown in mind and position accordingly!
Consider carefully when to use Thick Skin's active. Sometimes shielding early to avoid further damage is good, but sometimes the healing is more beneficial.
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 Tahm Kench 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, Tahm Kench sees a very large drop in his KDA (ratio of kills and assists to deaths) when paired with Karthus. His KDA decreased from NaN to NaN. This negative change shows that Karthus helps Tahm Kench perform not as well in competitive League of Legends matches. Yet, the small difference demonstrates that this performance change is not very impactful.
When Tahm Kench is paired with Karthus, he sees a small increase in his total damage output. This could indicate that Karthus supports by providing protection for him to dish out more damage or that his allyship also helps increase the round's duration. Similarly, when Tahm Kench is played together with Karthus on the same team, he usually scores many fewer killing sprees compared to when he plays without Karthus. This is contrasting evidence that he is worse when playing synergisticly with Karthus.
Moreover, when Tahm Kench plays with Karthus on the same side, he on average receives more damage than when he fights alone. Receiving more damage could mean that Karthus does a poor job of covering Tahm Kench during teamfights.
There is no universally accepted best companion for Tahm Kench that will 100% of the time be his #1 ally. However, overall, Karthus is a relatively poor companion for Tahm Kench. By playing on the same team as Tahm Kench, he drops their win rate by -2.1% to 49.5%. This shows that there is a harmful bond between Tahm Kench and Karthus that allows them to perform worse together than without each other.
Karthus has a greater difficulty than Tahm Kench. That means Tahm Kench players must be cautious when lining up Karthus teammates to play with, as they will need a greater level of skill to cooperate well with you.
Working together, Tahm Kench players should observe an overall large increase in your team’s capacity to to do a lot of AP damage. When paired, these two are able to dish out a surprising amount of magic type damage.
In contrast, by aligning Tahm Kench and Karthus together, you will not be providing your other teammates very much anti-tank damage dealing potential. Make sure to have other champions on your team that nullifies this disparity in this pairing's abilities.
Regardless of the skill of your Karthus ally, you need to focus on maximizing your gold income, outlasting your enemies, and clearing objectives. If you do this, you will do well anyway.
To learn all of the intricacies of Tahm Kench in order to work well with Karthus during both the early game and mid / late game phases of League, you should keep reading to learn a few extra tricks and insights into this champion pairing. If you listen to the build and stats shown here, you will increase your win rate by a lot.
The top finished items to use in your Tahm Kench and Karthus synergy build include Unending Despair, Heartsteel, and Hollow Radiance. When Tahm Kench used at least these three great items in his build, he performed much better when paired up with Karthus than with most other common item sets. In fact, Tahm Kench had an average winrate of 49.5% when synergizing his build and playstyle to Karthus with this build.
To have the best chance of crushing your oponents, Tahm Kench players should use the Grasp of the Undying, Shield Bash, Second Wind, Unflinching, Legend: Alacrity, and Triumph runes from the Resolve and Precision rune sets. Of all the rune sets players picked for this champion pairing, this combo of runes yielded the best win rate. In fact, these runes gave a 49.5% winrate overall.
If you need to view Tahm Kench and Karthus cooperations tips and stats for a a particular division, feel free to select one from the selection menu above. If viewing for the first time, the stats and strategies shown are calculated using all rounds with data with both champs.