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.
Use Demacian Standard as a scouting tool when worried about incoming enemies.
You can use the Dragon Strike / Demacian Standard combo to get out of your own Cataclysm arenas.
Split your basic attacks on different champions at the beginning of fights to maximize damage.
The Jax Jarvan IV synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Jarvan IV, 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 Jarvan IV. His KDA worsened from NaN to NaN. This decrease shows that Jarvan IV helps Jax perform not as well in competitive League matches. Yet, the small difference shows that this performance change is only marginal.
When Jax tries to synergize with Jarvan IV, he sees a sizeable uptick in his complete damage output. This difference could indicate that Jarvan IV provides protection for him to deal more damage or that his allyship also helps increase the game's duration. Similarly, when Jax is played alongside Jarvan IV on the same team, he usually scores many fewer killing sprees than when he plays without Jarvan IV. This is contrasting evidence that he is worse when playing alongside Jarvan IV.
Moreover, when Jax plays with Jarvan IV on the same team, he often receives a little less damage than when he plays alone. Receiving not as much damage could indicate that Jarvan IV does a decent job of protecting Jax during teamfights.
There is no universally accepted best ally for Jax that will no matter what be his best synergy. Yet, Jarvan IV is a very typical teammate for Jax. By being on the same team as Jax, he decreases their win rate by -0.1% to 50.7%. This signals that there is not really a strong strategic relationship between Jax and Jarvan IV that allows them to perform not as well together than alone.
Jarvan IV has a lower difficulty than Jax. That means Jax players don't need to be careful when lining up Jarvan IV allies to go into battle on the same side as, as they will require a relatively low level of skill to do well with you.
When playing alongside, you should observe an overall large increase in your team’s ability to dish out massive AD. Combined, these two can provide a great amount of sustained physical damage.
Conversely, by aligning Jax and Jarvan IV together, you will not be granting your team a lot of support. Plan to pick other champions on your team that nullifies this relative hole in this pairing's abilities.
Regardless of your Jarvan IV ally's ability, you should focus on maximizing your gold income, outlasting your enemies, and taking down objectives. If you heed this simple advice, you should do well, regardless.
To learn all of the intricacies of Jax in order to work well with Jarvan IV during both the lane and mid / late game phases of League of Legends games, you should continue reading to gather additional lessons on this champion pairing. If you use the build and suggestions presented above, you will increase your win rate by a lot.
The best items to focus on in your Jax and Jarvan IV synergy build consist of Sterak's Gage, Trinity Force, and Spear of Shojin. When Jax included at least these three pieces in his build, he performed significantly better as an ally of Jarvan IV than with most other commonly used item sets. In fact, Jax had an average win rate of 50.7% when playing alongside Jarvan IV with these items in his kit.
To have the greatest probability of annihilating your oponents, you should equip the Lethal Tempo, Triumph, Legend: Alacrity, Last Stand, Bone Plating, and Unflinching runes from the Precision and Resolve rune sets. Of all the runes players chose for this team composition, this blending of runes resulted in the best win rate. In fact, these runes provided a 50.7% winrate overall.
By default, tips, stats, and builds on how to team up Jarvan IV with Jax are shown for all ranked divisions. To scope the statistics and builds to a distinct division, you may use the selection menu located earlier in the counter matchup guide.