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.
Valkyrie can be used defensively as well, so try using it for a quick escape.
Phosphorus Bomb can be used to reveal enemy units that might be hiding in a nearby patch of brush.
Corki can continue to attack while using Gatling Gun. Maximizing Gatling Gun is key to mastering Corki.
The Karthus Corki synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Corki, 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 Corki. His KDA decreased from NaN to NaN. This drop shows that Corki helps Karthus perform not as well in ranked League of Legends rounds. Yet, the small difference demonstrates that this performance change is not very impactful.
When Karthus tries to synergize with Corki, he observes a small increase in his complete damage dealt. This change could demonstrate that Corki provides cover for him to dish out more damage or that his allyship also helps increase the game's duration. Similarly, when Karthus is played with Corki on the same team, he usually scores many fewer killing sprees than when he plays without Corki. This is contrasting evidence that he is worse when playing with Corki.
Moreover, when Karthus plays with Corki on the same side, he usually receives a little more damage than when he fights alone. Taking more damage may mean that Corki does a poor job of covering Karthus in teamfights.
There is no perfect champion pairing for Karthus that will 100% of the time be his #1 ally. Yet, Corki is a below average ally for Karthus. By being on the same side as Karthus, he decreases their win rate by -1.9% to 45.4%. This proves that there is a negative bond between Karthus and Corki that allows them to perform not as well together than without each other.
Corki has a lower difficulty than Karthus. That means you don't need to be very careful when lining up Corki comrades to go into battle on the same side as, as they will require a lower level of skill to be able to fight well with you.
Fighting cooperatively, you should expect to observe an overall large increase in your team’s capacity to to do a lot of AP damage. Together, these two can blast through enemies with magic damage.
In contrast, by grouping Karthus and Corki together, you probably will not be granting your other allies a great deal of tankyness. Plan to have other champions on your team that offsets this hole in their kit.
Regardless of the skill of your Corki teammate, you need to focus on maximizing your gold income, outlasting your enemies, and clearing objectives. If you heed this simple advice, you should do well anyway.
If you would like to learn all of the intricacies of Karthus in order to synergize with Corki during both the early game and mid / late game phases of League of Legends rounds, you should keep reading to gather additional tricks and insights into this champion pairing. If you mind the build and stats displayed above, you should grow your win rate significantly.
The most important finished items to include in your Karthus and Corki synergy build consist of Rabadon's Deathcap, Shadowflame, and Liandry's Torment. When Karthus bought at least these three items in his build, he performed a lot better when paired up with Corki than with many other typical builds. In fact, Karthus boasted an average winrate of 45.4% when synergizing his build and playstyle to Corki with this build.
To have the best chance of annihilating your oponents, Karthus players should take 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 combinations players chose for Karthus and Corki pairings, this order of runes yielded the top win rate. Notably, these runes averaged a 45.4% winrate overall.
By default, tips, stats, and builds on how to synergize Corki with Karthus are displayed for all ranked divisions combined. If you would like to scope the stats and builds to a distinct skill level, you can use the selection menu earlier in the counter matchup guide.