Lead your enemy when targeting with Noxious Blast to ensure the hit.
Use Twin Fang on poisoned stationary targets like monsters and units stunned by her Petrifying Gaze for maximum damage.
Try to engage him in short bursts instead of going toe-to-toe with him. Preventing him from attacking consecutively drastically lowers his damage output.
Jax can dodge all incoming attacks for a very short amount of time and stuns enemies in melee range when it ends. Wait to strike him until after his dodge is finished.
The stat comparisons shown on this page feature several significant Cassiopeia versus Jax matchup statistics that may help us interpret the distinctions between the two. As an example, Cassiopeia’s KDA ratio ([kills + assists] / deaths) of NaN is more than Jax’s ratio of NaN, indicating that Cassiopeia may be more central to her team's team fighting effectiveness than Jax..
Cassiopeia typically has a similar longest kill spree as her opponent does. Commonly, she receives less damage than Jax. This is usually reflective of different amounts of tankyness, yet it can also show that the one champion has less agility and thus is not able to kite away from additional damage when poked or engaged.
Both League champs are great. Both have their strengths, weaknesses, and counters. In the game's current meta, Cassiopeia usually wins when playing against Jax, with a 54.3% win rate. As a result, Cassiopeia makes a great counter for Jax.
While Cassiopeia does have a much higher winrate than Jax, when on opposite teams, Cassiopeia also has a much greater difficulty level that makes her a more complex character to pick up and master. You don't need to be too worried when picking Cassiopeia into Jaxas her relative depth means that you may not be able to unleash her full potential without a significant amount of practice beforehand.
Moreover, Cassiopeia also has a good amount of CC and other utility, a similar amount to Jax. This often makes her just as valuable during team fights, especially when facing champions with a ton of burst damage.
While there is not a single best champion in League of Legends, in Cassiopeia vs Jax matchups, Cassiopeia is the better champ with a noticably higher win rate, more champion depth, and a similar amount of utility to help out your team members during late stage team fights.
Cassiopeia is a great counter for Jax. You will do well by focussing your gameplay on maximizing your gold income and clearing objectives. If you are able to do that, you should hold your own as Cassiopeia against Jax.
To truly master Cassiopeia in order to counter Jax during both the early game and mid / late game phases of League of Legends, you should keep reading to learn a few extra tips and tricks for this matchup. If you listen to the build and suggestions displayed above, you will increase your win rate significantly and be closer to League of Legends pro players.
Cassiopeia usually accumulates a similar amount of CS as Jax. Champions who on average don't acquire many minion kills typically don't require much CS to be effective, such as supports. They are capable of scaling properly off of their skills, stats, and first items alone. Yet, champs with a lot of CS, such as hyper-carries, usually require many items to be effective. In either case, try to surpass the values displayed on this page to do well.
The ideal items to prioritize in your Cassiopeia versus Jax build include Liandry's Anguish, Seraph's Embrace, and Rylai's Crystal Scepter. When Cassiopeia incorporated at least these three items in her build, she performed significantly better when fighting Jax than with most other commonly used item sets. In fact, Cassiopeia had an average win rate of 54.3% battling Jax with this build.
To have the best chance of coming out on top against Jax as Cassiopeia, you should equip the Conqueror, Presence of Mind, Legend: Tenacity, Last Stand, Conditioning, and Overgrowth runes from the Precision and Resolve rune sets. Of all the rune combinations players chose for Cassiopeia vs Jax battles, this combo of runes resulted in the greatest win rate. Moreover, these runes provided a 54.3% win rate overall.
By default, tips, statistics, and builds on how to beat Jax as Cassiopeia are given for all skill levels, merged. To narrow the statistics and builds to a distinct rank, you may use the selection menu located earlier on the page.