Using Deceive over terrain can help you make a clean escape.
Try getting items with on-hit effects. These will also benefit your Hallucination clone.
Backstab's damage can be increased with increased Critical Damage effects like Infinity Edge.
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 Shaco 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, Shaco sees a very large drop in his KDA (ratio of kills and assists to deaths) when paired with Karthus. His KDA worsened from NaN to NaN. This decrease shows that Karthus helps Shaco perform worse in competitive League games. Yet, the small difference demonstrates that this performance change is only marginal.
When Shaco plays on the same team as Karthus, he observes a little increase in his complete damage dealt. This may indicate that Karthus helps provide cover for him to deal more damage or that his support also helps extend the round's duration. Similarly, when Shaco 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 Shaco plays with Karthus on the same team, he usually receives a little less damage than when he fights alone. Receiving not as much damage may indicate that Karthus does a decent job of protecting Shaco in team fights.
There is no universally accepted best ally for Shaco that will always be his #1 synergy. However, overall, Karthus is a very typical companion for Shaco. By locking into the same side as Shaco, he lowers their win rate by -0.3% to 49.1%. This clearly indicates that there is not really a strong strategic relationship between Shaco and Karthus that results in them performing not as well together than without each other.
Karthus has a lower difficulty than Shaco. That means Shaco players don't need to be very careful when lining up Karthus comrades to go into battle on the same side as, as they will require a relatively low level of skill to fight well with you.
Playing on the same side, Shaco players will likely see an overall large increase in your team’s capability to deal magic damage. Together, these champs can deal quite a lot of AP type damage.
Conversely, by pairing Shaco and Karthus together, you may not be granting your other allies very much engage. Make sure to include other champs on your team that neutralizes this hole in their capabilities.
Regardless of your Karthus ally's ability, you should focus on increasing your gold income, outlasting your enemies, and clearing objectives. If you do this, you will do well anyway.
If you would like to learn all of the intricacies of Shaco in order to work well with Karthus during both the early game and mid / late game phases of LoL, you should keep reading to gather a few extra lessons on this champion pairing. If you pay attention to the build and tips shown above, you will grow your win rate significantly.
The top items to have in your Shaco and Karthus synergy build consist of Zaz'Zak's Realmspike, Liandry's Torment, and Luden's Companion. When Shaco bought at least these three finished items in his build, he performed significantly better as an ally of Karthus than with most other typical item sets. In fact, Shaco had an average winrate of 49.1% when playing alongside Karthus with these items in his kit.
To have the highest chance of coming out on top against your oponents, you should equip the Arcane Comet, Manaflow Band, Transcendence, Scorch, Biscuit Delivery, and Cosmic Insight runes from the Sorcery and Inspiration rune sets. Of all the runes that we analyzed for this champion pairing, this blending of runes yielded the greatest win rate. Moreover, these runes provided a 49.1% winrate overall.
By default, tips, statistics, and builds on how to synergize Karthus with Shaco are given for all ranked divisions. If you want to scope the stats and builds to an individual skill level, you can use the selection menu located earlier in the counter matchup guide.