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.
Use the time after Sion has died to reposition and prepare for his return.
Even if Sion still hits a Decimating Smash, making him release the charge earlier reduces its impact.
The stat comparisons provided here highlight several vital Kai'Sa versus Sion matchup stats that can help you understand the differences between this set of champs. For instance, Kai'Sa’s KDA ratio ([kills + assists] / deaths) of NaN is better than Sion’s ratio of NaN, indicating that Kai'Sa may be more central to her team's team fighting capability than Sion. This observation is largely fueled by the difference in kills.
Kai'Sa often has a much larger longest kill spree than her enemy does. Typically, she takes less damage than Sion. This is usually reflective of different amounts of tankyness, but it can also show that the one champion has less agility and thus is not able to escape additional damage when engaged or poked.
Both League of Legends champions are great champions. Both have their strengths, weaknesses, and counters. In League's current meta, Kai'Sa usually loses when playing against Sion, with a 45.7% win rate. Therefore, Kai'Sa makes a bad counter to Sion.
While Kai'Sa does have a much lower win rate compared to Sion, when facing one another, Kai'Sa also has a greater learning curve that makes her a more complex character to pick up and master. You should expect to face a difficult match when picking Kai'Sa into Sion.
Moreover, Kai'Sa also has only a small amount of CC and other utility, a similar amount to Sion. This makes her just as valuable during teamfights, especially when facing champions with a ton of burst damage.
While there is not one best champion overall in League of Legends, in Kai'Sa vs Sion matchups, Sion is the better champion with a much lower win rate, more champion depth, and a similar amount of utility to help out your team members during teamfights.
Kai'Sa is a garbage counter to Sion. You will do well by focussing your tactics on increasing your CS and clearing objectives. If you are able to do that, you should hold your own as Kai'Sa against Sion.
To learn all of the intricacies of Kai'Sa to counter Sion during both the early game and mid / late game phases of League of Legends, you should continue reading to pick up a few extra tricks and insights into this matchup. If you listen to the build and stats presented above, you will grow your win rate by a lot and be that much closer to League of Legends pro players.
Kai'Sa most often racks up a similar amount of CS as Sion. Champs who on average don't take many minion kills usualy don't require much CS to be effective, such as supports. They are capable of scaling well off of their abilities and first items alone. Yet, champions with a lot of CS, such as hyper-carries, typically need several high cost items to be effective. In either case, try to do better than the numbers reported here to do well.
The most important items to focus on in your Kai'Sa versus Sion build consist of Nashor's Tooth, Guinsoo's Rageblade, and Terminus. When Kai'Sa bought at least these three items in her build, she did much better vs Sion than with most other commonly used builds. In fact, Kai'Sa had an average winrate of 45.7% battling Sion with this build.
To have the best chance of coming out on top against Sion as Kai'Sa, you should equip the Hail of Blades, Taste of Blood, Eyeball Collection, Treasure Hunter, Biscuit Delivery, and Magical Footwear runes from the Domination and Inspiration rune sets. Of all the runes players used for Kai'Sa vs Sion face-offs, this composite of runes resulted in the best win rate. Notably, these runes provided a 45.7% win rate overall.
By default, tips, statistics, and builds on how to beat Sion as Kai'Sa are displayed for all ranked divisions. If you want to narrow the statistics and builds to an individual player tier, you can use the selection menu located at the top of this page.