Take advantage of Flurry by weaving in basic attacks between spell casts - this maximizes damage output and minimizes Energy loss.
Self-casting Safeguard and using Iron Will are powerful tools for killing neutral monsters (in the jungle).
Use Sonic Wave before Dragon's Rage so you can chase the target with Resonating Strike.
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 Lee Sin 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, Lee Sin 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 drop shows that Karthus helps Lee Sin perform poorer in competitive LoL matches. Yet, the small difference shows that this performance change is only marginal.
When Lee Sin is an ally to Karthus, he sees a sizeable uptick in his total damage output. This may indicate that Karthus helps provide cover for him to dish out more damage or that his support also helps extend the round's duration. Similarly, when Lee Sin is played alongside Karthus 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 Karthus.
Moreover, when Lee Sin plays with Karthus on the same team, he typically receives a little more damage than when he plays alone. Getting dealt more damage may mean that Karthus does a poor job of protecting Lee Sin during teamfights.
There is no universally accepted best champion pairing for Lee Sin that will always be his top teammate. However, overall, Karthus is a terrible teammate for Lee Sin. By locking into the same team as Lee Sin, he decreases their win rate by -3.3% to 44.0%. This signals that there is a very bad bond between Lee Sin and Karthus that results in them performing not as well together than without each other.
Karthus has a greater difficulty than Lee Sin. That means you need to be cautious when finding Karthus teammates to go into battle on the same side as, as they will require a greater level of skill to do well with you.
Working cooperatively, Lee Sin players should observe an overall large increase in your team’s capability to to do a lot of AP damage. Together, these two can blast through enemies with magic damage.
Conversely, by pairing Lee Sin and Karthus together, you may not be providing your other allies enough cover. Make sure to include other champions on your team that fills this relative hole in this pairing's potential.
Regardless of your Karthus ally's ability, you should focus on maximizing your income, warding to avoid ambushes, and clearing objectives. If you follow these simple suggestions, you will do well, regardless.
To learn all of the intricacies of Lee Sin in order to synergize with Karthus during both the early game and mid / late game phases of League of Legends rounds, you should continue reading to master additional tips and tricks for this champion pairing. If you use the build and stats displayed here, you will increase your win rate by a lot.
The most crucial finished items to get in your Lee Sin and Karthus synergy build include Black Cleaver, Death's Dance, and Sundered Sky. When Lee Sin combined at least these three finished items in his build, he performed a lot better when fighting alongside Karthus than with most other commonly used builds. In fact, Lee Sin had an average winrate of 44.0% when playing alongside Karthus with this build.
To have the highest chance of annihilating your oponents, you should use the Conqueror, Triumph, Legend: Alacrity, Coup de Grace, Cosmic Insight, and Magical Footwear runes from the Precision and Inspiration rune sets. Out of all the rune sets players picked for this champion pairing, this combination of runes resulted in the highest win rate. Moreover, these runes provided a 44.0% winrate overall.
If you would like to see Lee Sin and Karthus collaboration tips and stats for a a distinct skill level, please choose one from the selection menu displayed above. By default, the stats and tips and suggestions shown are calculated using every game finished with both champions.