Jax benefits greatly from items that have both Ability Power and Attack Damage such as Guinsoo's Rageblade and Hextech Gunblade.
Jax can Leap Strike to friendly units, including wards. You can use them to plan your escape.
Make sure to buy items that will evolve at least 1 or 2 of your spells.
Work with your teammates to set up your Ultimate and optimize damage with your passive.
Try to catch enemy carries alone to burst them with Icathian Rain.
The Jax Kai'Sa synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Kai'Sa, compared to his overall stats. Significant differences are areas of focus that highlight how his gameplay changes when paired with this other champion.
Overall, Jax sees a very large drop in his KDA (ratio of kills and assists to deaths) when paired with Kai'Sa. His KDA worsened from NaN to NaN. This negative change shows that Kai'Sa helps Jax perform not as well in competitive League games. Yet, the small difference proves that this performance change is only marginal.
When Jax is an ally to Kai'Sa, he gets a small decrease in his total damage output. This difference may indicate that Kai'Sa does not support by providing cover for him to dish out more damage or that her allyship also helps extend the round's duration. Similarly, when Jax is played together with Kai'Sa on the same team, he usually scores many fewer killing sprees than when he plays on his own. This is contrasting evidence that he is worse when playing synergisticly with Kai'Sa.
Additionally, when Jax plays with Kai'Sa on the same team, he on average takes a little less damage than when he plays alone. Getting dealt not as much damage may indicate that Kai'Sa does a decent job of protecting Jax during team fights.
There is no universally accepted best champion pairing for Jax that will always be his top synergy. Yet, Kai'Sa is a relatively poor teammate for Jax. By playing on the same team as Jax, she drops their win rate by -3.0% to 47.8%. This signals that there is a negative bond between Jax and Kai'Sa that results in them performing not as well together than alone.
Kai'Sa has a greater difficulty than Jax. That means you must be cautious when enlisting Kai'Sa allies to fight alongside, as they will require a greater level of skill to play well with you.
Working together, Jax players should observe an overall large increase in your team’s capacity to dish out massive AD. Together, these two should be able to take down targets with auto-attacks and other AD damage abilities.
Conversely, by aligning Jax and Kai'Sa together, you may not be providing your other allies a great deal of support. Make sure to pick other champions on your team that nullifies this gap in this pairing's abilities.
Regardless of your Kai'Sa ally's ability, you should focus on maximizing your gold income, warding to avoid ambushes, and clearing objectives. If you heed this simple advice, you should do well, regardless.
If you would like to truly master Jax in order to pair well with Kai'Sa during both the lane and mid / late game phases of League rounds, you should keep reading to gather a few extra tricks and insights into this champion pairing. If you pay attention to the build and suggestions presented here, you will grow your win rate significantly.
The ideal finished items to use in your Jax and Kai'Sa synergy build include Sterak's Gage, Blade of The Ruined King, and Sundered Sky. When Jax incorporated at least these three finished items in his build, he did a lot better when fighting alongside Kai'Sa than with many other common item sets. In fact, Jax boasted an average winrate of 47.8% when playing alongside Kai'Sa with this build.
To have the highest chance of vanquishing your oponents, you should use the Lethal Tempo, Triumph, Legend: Alacrity, Last Stand, Cosmic Insight, and Magical Footwear runes from the Precision and Inspiration rune sets. Out of all the rune builds players used for Jax and Kai'Sa pairings, this combo of runes yielded the greatest win rate. Notably, these runes provided a 47.8% win rate overall.
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