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.
Karthus can cast spells for a short duration after he is killed. Move away from his corpse to be safe.
Make sure you always have enough health to survive Requiem, even if you have to go back to the base more frequently to heal.
The stat comparisons provided here feature several strategic Sejuani versus Karthus counter stats that can help you distinguish the differences and similarities between this pair of champs. Sejuani’s KDA ratio ([kills + assists] / deaths) of NaN is better than Karthus’s ratio of NaN, highlighting that Sejuani may be more central to her team's team fighting potential than Karthus..
Sejuani normally has a slightly smaller longest kill spree than her foe does. On average, she receives more damage than Karthus. This is usually reflective of different amounts of tankyness; however, it can also show that the champion with higher health has less agility and thus is not able to kite away from further harm when poked or engaged.
Both League champs are great champions. Both champs have their pros and cons. In the game's current meta, Sejuani usually wins when taking on Karthus, with a 52.6% win rate. As a result, Sejuani makes a good counter to Karthus.
While Sejuani does have a higher win rate than Karthus, when facing one another, Sejuani also has a lower level of difficulty that makes her a less complex champ to learn and master. You should be be fine when picking Sejuani into Karthus.
Additionally, Sejuani also has a good amount of CC and other utility, a similar amount to Karthus. This often makes her just as valuable during teamfights, especially when facing champions with a lot of burst damage.
While there is not a single best champion in League of Legends, in Sejuani vs Karthus 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 team members during teamfights.
Sejuani is an above average counter for Karthus. Make sure you focus your tactics on maximizing your gold income and clearing objectives. If you do that, you should hold your own as Sejuani against Karthus.
If you would like to learn all of the intricacies of Sejuani in order to counter Karthus during both the early game and mid / late game phases of League of Legends, you should keep reading to pick up a few extra lessons on this matchup. If you listen to the build and stats presented above, you should grow your win rate by a lot and be that much closer to League of Legends pro players.
Sejuani most often gets less CS compared to Karthus. Champs who on average don't earn much CS usualy don't have to have much CS to be effective, such as sup champs. These kinds of champions are capable of scaling well off of their skills, stats, and first items alone. Yet, champs with a lot of CS, such as hyper-carries, often have to have many items to be effective. In either case, try to surpass the numbers reported here to do well.
The ideal items to have in your Sejuani versus Karthus build consist of Sunfire Aegis, Thornmail, and Jak'Sho, The Protean. When Sejuani used at least these three pieces in her build, she performed a lot better vs. Karthus than with most other common builds. In fact, Sejuani had an average win rate of 52.6% when playing against Karthus with these items in her kit.
To have the greatest likelihood of crushing Karthus as Sejuani, you should equip the Aftershock, Font of Life, Conditioning, Overgrowth, Legend: Alacrity, and Triumph runes from the Resolve and Precision rune sets. Of all the rune builds players used for Sejuani vs Karthus clashes, this mixture of runes yielded the greatest win rate. In fact, these runes averaged a 52.6% win rate overall.
By default, tips, stats, and builds on how to beat Karthus as Sejuani are presented for all skill levels combined. If you would like to narrow the statistics and builds to an individual skill level, you should use the selection menu located at the top of this page.