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 stats shown here underscore some vital Sejuani vs. Zeri matchup stats that can help you interpret the differences between the pair. As an example, Sejuani’s KDA ratio ([kills + assists] / deaths) of NaN is better than Zeri’s ratio of NaN, indicating that Sejuani may be more central to her team's team fighting potential than Zeri. This observation is largely caused by the differences in assists.
Sejuani normally has a slightly smaller longest killing spree than her enemy does. Typically, she receives more damage than Zeri. This often reflects differing health capacities, yet it can also show that the one champ has less agility and thus is unable to kite away from further damage when engaged or poked.
Both League champions are great champions. Both champs have their pros and cons. In League's current meta, Sejuani usually wins when playing against Zeri, with a 54.8% win rate. Thus, Sejuani makes a great counter for Zeri.
While Sejuani does have a much higher winrate than Zeri, when they face off with one another, Sejuani also has a lower level of difficulty that makes her a less challenging champion to learn. You should be be fine when picking Sejuani into Zeri.
Furthermore, Sejuani has a good amount of utility and CC, a similar amount to Zeri. This often makes her just as valuable during team fights, especially when fighting champions with a lot of burst damage.
While there is not one best champion overall in League of Legends, in Sejuani vs Zeri matchups, Sejuani is the better champion with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your teammates during teamfights.
Sejuani is a great counter for Zeri. Make sure you focus your actions on maximizing your gold and cs and destroying objectives. If you are able to do that, you should do very well as Sejuani against Zeri.
To truly master Sejuani to counter Zeri during both the lane and mid / late game phases of League of Legends, you should keep reading to learn a few extra tricks and insights into this matchup. If you listen to the build and suggestions presented here, you should increase your win rate significantly and be that much closer to League of Legends pro players.
Sejuani on average gets a lot less CS as Zeri. Champs who on average don't take much CS usualy don't have to have much CS to be valuable teammates, such as sup champs. They are able to scale well off of their abilities and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, typically need several high cost items to be effective. In either situation, try to surpass the numbers shown here to do well.
The most important items to prioritize in your Sejuani versus Zeri build include Sunfire Aegis, Thornmail, and Jak'Sho, The Protean. When Sejuani used at least these three items in her build, she performed significantly better when facing Zeri than with many other common counter builds. In fact, Sejuani had an average winrate of 54.8% when countering Zeri with these items in her kit.
To have the greatest probability of defeating Zeri as Sejuani, Sejuani players should equip the Aftershock, Font of Life, Conditioning, Overgrowth, Legend: Alacrity, and Triumph runes from the Resolve and Precision rune sets. Of all the runes players picked for Sejuani vs Zeri counterpicks, this order of runes yielded the best win rate. Moreover, these runes provided a 54.8% win rate overall.
By default, tips, statistics, and builds on how to beat Zeri as Sejuani are given for all ranked divisions. If you want to filter the statistics and builds to a specific rank, you can use the selection menu earlier in the counter matchup guide.