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.
Make sure you choose the right augment at the right time.
Death Ray is a powerful poke and a strong area of denial tool. Use it in combination with Gravity Field to control your enemy's position.
The Karthus Viktor synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Viktor, 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 Viktor. His KDA worsened from NaN to NaN. This drop shows that Viktor helps Karthus perform not as well in ranked LoL rounds. Yet, the small difference demonstrates that this performance change is not very impactful.
When Karthus is paired with Viktor, he gets a little drop in his complete damage dealt. This change could indicate that Viktor does not support by providing protection for him to deal more damage or that his participation also helps extend the round's duration. Similarly, when Karthus is played alongside Viktor on the same side, he usually scores many fewer killing sprees compared to when he plays alone. This is contrasting evidence that he is worse when playing synergisticly with Viktor.
Additionally, when Karthus plays with Viktor on the same team, he often receives a little more damage than when he fights alone. Taking more damage may indicate that Viktor does a poor job of protecting Karthus during team fights.
There is no top synergy for Karthus that will always be his #1 teammate. Yet, overall, Viktor is a very typical companion for Karthus. By being on the same side as Karthus, he improves their win rate by 0.3% to 47.6%. This shows that there is a weak bond between Karthus and Viktor that results in them performing better together than without each other.
Viktor has a greater difficulty than Karthus. That means Karthus players need to be very careful when finding Viktor teammates to go into battle on the same side as, as they will need a greater level of skill to be able to work well with you.
Working together, Karthus players should expect to witness an overall large increase in your team’s ability to deal magical damage. Together, these two can blast through enemies with magic damage.
Although, by pairing Karthus and Viktor together, you may not be granting your team enough anti-tank damage dealing potential. Make sure to bring other champions on your team that offsets this relative gap in this pairing's playstyle.
Regardless of the ability of your Viktor ally, you need to focus on maximizing your gold income, warding to avoid ambushes, and taking down objectives. If you heed this simple advice, you should do well, regardless.
If you would like to truly master Karthus to synergize with Viktor during both the laning and mid / late game phases of League of Legends, you should continue reading to pick up a few extra tips and tricks for this champion pairing. If you listen to the build and suggestions presented above, you will grow your win rate significantly.
The most important finished items to prioritize in your Karthus and Viktor synergy build consist of Rabadon's Deathcap, Malignance, and Shadowflame. When Karthus used at least these three great items in his build, he did significantly better as an ally of Viktor than with most other commonly used builds. In fact, Karthus boasted an average win rate of 47.6% when playing alongside Viktor with this build.
To have the best likelihood of vanquishing your oponents, you should take the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Eyeball Collection, and Ultimate Hunter runes from the Inspiration and Domination rune sets. Of all the rune sets players used for this team composition, this blending of runes resulted in the top win rate. Moreover, these runes averaged a 47.6% win rate overall.
By default, tips, statistics, and builds on how to synergize Viktor with Karthus are displayed for all skill levels combined. To narrow the statistics and builds to a specific player tier, you can use the selection menu located above.