For increased range and damage, try casting Shock Blast through the Acceleration Gate.
If you find yourself taking lots of damage, try using Jayce's Hammer Stance, as it grants you additional defenses.
Be sure to switch stances often. It will enhance your attacks and grant you quick bursts of speed.
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 Jayce 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, Jayce sees a large worsening in his KDA (ratio of kills and assists to deaths) when paired with Karthus. His KDA worsened from NaN to NaN. This negative change shows that Karthus helps Jayce perform worse in competitive LoL matches. Yet, the small difference indicates that this performance change is only marginal.
When Jayce plays on the same team as Karthus, he gets a barely noticable drop in his complete damage dealt. This could signal that Karthus does not support by providing cover for him to dish out more damage or that his support also helps extend the round's duration. Similarly, when Jayce is played alongside Karthus on the same team, 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.
Additionally, when Jayce plays with Karthus on the same team, he often takes a little more damage than when he plays alone. Receiving more damage could mean that Karthus does a poor job of covering Jayce during teamfights.
There is no perfect champion pairing for Jayce that will no matter what be his best synergy. However, overall, Karthus is a very typical teammate for Jayce. By playing on the same side as Jayce, he drops their win rate by -0.6% to 47.2%. This signals that there is not really a strong bond between Jayce and Karthus that results in them performing not as well together than without each other.
Karthus has a lower difficulty than Jayce. That means Jayce players don't need to be very careful when finding Karthus allies to fight alongside, as they will need a lower level of skill to play well with you.
When playing cooperatively, Jayce players will likely observe an overall large increase in your team’s ability to deal magical damage. Together, these champions can blast through enemies with magic damage.
Although, by pairing Jayce and Karthus together, you probably will not be granting your team much tankyness. Plan to include other champs on your team that helps cover this hole in this pairing's potential.
Regardless of your Karthus ally's ability, you need to focus on maximizing your gold income, warding to avoid ambushes, and clearing objectives. If you do this, you should do well anyway.
To truly master Jayce in order to synergize with Karthus during both the lane and mid / late game phases of League games, you should continue reading to learn some more lessons on this champion pairing. If you pay attention to the build and tips shown here, you will increase your win rate significantly.
The most crucial items to prioritize in your Jayce and Karthus synergy build include Muramana, Serylda's Grudge, and Opportunity. When Jayce incorporated at least these three pieces in his build, he performed significantly better when fighting alongside Karthus than with many other commonly used builds. In fact, Jayce boasted an average winrate of 47.2% when synergizing his build and playstyle to Karthus with this build.
To have the highest probability of crushing your oponents, you should use the Phase Rush, Manaflow Band, Absolute Focus, Gathering Storm, Biscuit Delivery, and Magical Footwear runes from the Sorcery and Inspiration rune sets. Out of all the rune sets players picked for this champion pairing, this mix of runes resulted in the best win rate. In fact, these runes provided a 47.2% win rate overall.
By default, tips, stats, and builds on how to synergize Karthus with Jayce are presented for all ranked divisions combined. If you would like to filter the statistics and builds to an individual rank, you should use the selection menu located earlier in the counter matchup guide.