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.
Melee allies can stack Frost for your Permafrost, keep an eye on who they are attacking.
Save Glacial Prison for encounters where you have teammates present to take advantage of it.
Use Arctic Assault to escape bad situations, interupt channeled spells or chase runners.
The Cassiopeia Sejuani synergy stats shown here demonstrate the areas of her gameplay that do better (or worse) when paired with Sejuani, compared to her overall stats. Significant differences are areas of focus that highlight how her gameplay changes when paired with this other champion.
Overall, Cassiopeia sees a very large drop in her KDA (ratio of kills and assists to deaths) when paired with Sejuani. His KDA fell from NaN to NaN. This drop shows that Sejuani helps Cassiopeia perform poorer in competitive LoL games. Yet, the small difference demonstrates that this performance change is not very impactful.
When Cassiopeia tries to synergize with Sejuani, she observes a little increase in her full damage output. This difference could signal that Sejuani supports by providing cover for her to deal more damage or that her presence on the team also helps increase the round's duration. Similarly, when Cassiopeia is played with Sejuani on the same side, he usually scores many fewer killing sprees compared to when she plays alone. This is contrasting evidence that she is worse when playing synergisticly with Sejuani.
Additionally, when Cassiopeia plays with Sejuani on the same team, she often takes a little more damage than when she plays alone. Taking more damage could indicate that Sejuani does a poor job of covering Cassiopeia in team fights.
There is no ideal champion pairing for Cassiopeia that will 100% of the time be her best teammate. However, Sejuani is a terrible teammate for Cassiopeia. By playing on the same team as Cassiopeia, she decreases their win rate by -5.4% to 44.9%. This shows that there is a terrible synergy between Cassiopeia and Sejuani that results in them performing not as well together than without each other.
Sejuani has a much lower diffuclty than Cassiopeia. That means you don't need to be very careful when finding Sejuani teammates to go into battle on the same side as, as they will require a much lower level of skill to play well with you.
When playing cooperatively, you should expect to see an overall large increase in your team’s ability to to do a lot of AP damage. Combined, these two can deal quite a lot of AP type damage.
Conversely, by aligning Cassiopeia and Sejuani together, you probably will not be providing your team enough attack damage. Make sure to bring other champs on your team that helps cover this relative disparity in their kit.
Regardless of the ability of your Sejuani teammate, you should focus on maximizing your gold income, outlasting your enemies, and taking down objectives. If you do this, you should do well anyway.
If you would like to truly master Cassiopeia in order to pair well with Sejuani during both the laning and mid / late game phases of League of Legends rounds, you should continue reading to master additional lessons on this champion pairing. If you mind the build and suggestions displayed above, you will increase your win rate by a lot.
The top finished items to use in your Cassiopeia and Sejuani synergy build consist of Seraph's Embrace, Liandry's Torment, and Rod of Ages. When Cassiopeia bought at least these three items in her build, she performed significantly better when paired up with Sejuani than with most other commonly used builds. In fact, Cassiopeia had an average winrate of 44.9% helping carry Sejuani with these items in her kit.
To have the highest probability of coming out on top against your oponents, you should take the Conqueror, Presence of Mind, Legend: Tenacity, Last Stand, Manaflow Band, and Transcendence runes from the Precision and Sorcery rune sets. Of all the rune sets that we analyzed for this champion pairing, this sequence of runes resulted in the highest win rate. Notably, these runes provided a 44.9% winrate overall.
By default, tips, stats, and builds on how to pair Sejuani with Cassiopeia are displayed for all skill levels, merged. If you want to scope the statistics and builds to a specific player tier, you may use the selection menu at the top of this page.