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 Karthus Viego synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Viego, 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 Viego. His KDA worsened from NaN to NaN. This fall shows that Viego helps Karthus perform worse in competitive League games. Yet, the small difference proves that this performance change is not very impactful.
When Karthus is an ally to Viego, he sees a little drop in his full damage dealt. This difference could indicate that Viego doesn't help protection for him to deal more damage or that their presence also helps increase the round's duration. Similarly, when Karthus is played alongside Viego on the same team, he usually scores many fewer killing sprees than when he plays without Viego. This is contrasting evidence that he is worse when playing with Viego.
Additionally, when Karthus plays with Viego on the same team, he usually takes much less damage than when he plays alone. Receiving not as much damage may mean that Viego does a decent job of protecting Karthus in team fights.
There is no universally accepted best ally for Karthus that will 100% of the time be his top synergy. However, Viego is a very typical ally for Karthus. By playing on the same side as Karthus, they raises their win rate by 0.1% to 47.4%. This shows that there is a weak bond between Karthus and Viego that results in them performing at the top of their game together than alone.
Viego has a lower difficulty than Karthus. That means you don't need to be careful when lining up Viego allies to go into battle on the same side as, as they will have to have a relatively low level of skill to be able to play well with you.
Playing together, Karthus players will likely see an overall large increase in your team’s capacity to deal magic damage. Together, these champions can deal quite a lot of AP type damage.
In contrast, by bringing Karthus and Viego together, you may not be giving your team very much cover. Plan to pick other champs on your team that neutralizes this relative hole in their abilities.
Regardless of your Viego ally's skill level, you should focus on increasing your gold income, warding to avoid ambushes, and taking down objectives. If you do this, you will do well, regardless.
If you would like to truly master Karthus to pair well with Viego during both the lane and mid / late game phases of LoL matches, you should keep reading to pick up some more tricks and insights into this champion pairing. If you mind the build and suggestions presented here, you should increase your win rate by a lot.
The best finished items to include in your Karthus and Viego synergy build include Rabadon's Deathcap, Malignance, and Shadowflame. When Karthus included at least these three pieces in his build, he performed significantly better when fighting alongside Viego than with most other typical builds. In fact, Karthus boasted an average winrate of 47.4% when playing alongside Viego with this build.
To have the best chance of annihilating your oponents, you should use the Dark Harvest, Cheap Shot, Eyeball Collection, Ultimate Hunter, Presence of Mind, and Last Stand runes from the Domination and Precision rune sets. Out of all the rune builds that we analyzed for this team composition, this sequence of runes yielded the top win rate. In fact, these runes provided a 47.4% win rate overall.
By default, tips, stats, and builds on how to pair Viego with Karthus are given for every ranked division. If you want to filter the statistics and builds to a specific rank, you should use the selection menu earlier on the page.