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.
Dodging Arctic Assault and Glacial Prison can give you a huge advantage.
Focus on avoiding the second swing of Winter's Wrath which carries the brunt of the damage.
Melee enemies can also stack Frost for Sejuani, be very careful around them.
The stats shown on this page emphasize several important Kai'Sa versus Sejuani counter statistics that may help you interpret the differences and similarities between this set of champs. As an example, Kai'Sa’s KDA ratio ([kills + assists] / deaths) of NaN is better than Sejuani’s KDA ratio of NaN, demonstrating that Kai'Sa may be more central to her team's team fighting effectiveness than Sejuani. This observation is in large part a result of the difference in kills.
Kai'Sa usually has a much larger longest killing spree than her foe does. On average, she receives less damage than Sejuani. This often reflects different amounts of tankyness, but it can also show that the champion with higher health has less agility and thus is not able to kite away from additional harm when engaged or poked.
Both League of Legends champs are great champions. Both champs have their strengths, weaknesses, and counters. In the game's current meta, Kai'Sa usually fairs equally well when playing against Sejuani, with a 50.4% win rate. As a result, Kai'Sa makes an ok counter for Sejuani.
While Kai'Sa does have a higher win rate compared to Sejuani, when they face off with one another, Kai'Sa also has a greater learning curve that makes her a more difficult champ to pick up and master. You still need to be cautious when picking Kai'Sa into Sejuani.
Moreover, Kai'Sa has almost no amount of utility and CC, a similar amount to Sejuani. This makes her just as valuable during teamfights, especially when facing champions with a lot of burst damage.
While there isn't a single best champion overall in League of Legends, in Kai'Sa vs Sejuani matchups, Kai'Sa is the better champion with a similar win rate, more champion depth, and a similar amount of utility to help out your allies during teamfights.
Kai'Sa is a decent counter to Sejuani. You will do well by focussing your strategy on maximizing your gold and cs and clearing objectives. If you can do that, you should be able to stand on your own as Kai'Sa against Sejuani.
If you would like to truly master Kai'Sa to counter Sejuani during both the lane and mid / late game phases of League of Legends, you should keep reading to gather a few extra tips and tricks for this matchup. If you pay attention to the build and tips shown above, you will grow your win rate significantly and be closer to League of Legends pro players.
Kai'Sa typically racks up much more CS relative to Sejuani. Champs who on average don't acquire much CS often don't need much CS to be valuable teammates, such as support champions. These kinds of champions are capable of scaling properly off of their abilities and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, often need a lot of items to be effective. In either situation, try to do better than the values shown on this page to do well.
The ideal items to prioritize in your Kai'Sa versus Sejuani build consist of Guinsoo's Rageblade, Blade of The Ruined King, and Kraken Slayer. When Kai'Sa used at least these three items in her build, she performed significantly better vs Sejuani than with most other commonly used counter builds. In fact, Kai'Sa boasted an average win rate of 50.4% battling Sejuani with this build.
To have the greatest probability of defeating Sejuani as Kai'Sa, you should equip the Lethal Tempo, Presence of Mind, Legend: Bloodline, Coup de Grace, Biscuit Delivery, and Magical Footwear runes from the Precision and Inspiration rune sets. Of all the rune builds players chose for Kai'Sa vs Sejuani LoL games, this combo of runes yielded the greatest win rate. Notably, these runes provided a 50.4% win rate overall.
By default, tips, stats, and builds on how to beat Sejuani as Kai'Sa are shown for all skill levels, merged. To scope the stats and builds to a particular skill level, you should use the selection menu earlier in the counter matchup guide.