Lay Waste is very strong at farming minions and harassing enemy champions.
Ask your allies to help point out when you should use Requiem to get kills in different lanes.
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 here emphasize several strategic Karthus against Sejuani counter stats that can help us understand the differences and similarities between this pair of champs. Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is better than Sejuani’s KDA ratio of NaN, highlighting that Karthus may be more central to his team's team fighting effectiveness than Sejuani..
Karthus usually has a slightly larger longest killing spree than his opponent does. On average, he takes less damage than Sejuani. This is usually reflective of differing health capacities, yet it can also imply that the champ with increased HP has less mobility and thus is not able to kite away from additional harm when engaged or poked.
Both League of Legends champs are great. Both have their pros and cons. In the game's current meta, Karthus usually loses when trying to fight Sejuani, with a 47.4% win rate. Thus, Karthus makes a bad counter for Sejuani.
While Karthus does have a lower winrate than Sejuani, when on opposite teams, Karthus also has a much greater difficulty level that makes him a more difficult champ to learn. You may get destroyed when picking Karthus into Sejuanias his relative depth means you may not be able to reach his full potential without a lot of practice beforehand.
Moreover, Karthus has some amount of utility and CC, a similar amount to Sejuani. This often makes her just as valuable during team fights, especially when trying to counter champions with a lot of burst damage.
While there is not a single best champion for every situation in League of Legends, in Karthus vs Sejuani matchups, Sejuani is the better champ with a lower win rate, more champion depth, and a similar amount of utility to help out your teammates during teamfights.
Karthus is a terribly counter to Sejuani. Make sure you focus your gameplay on increasing your gold income and taking out objectives. If you do that, you should do very well as Karthus against Sejuani.
If you would like to truly master Karthus in order 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 tricks and insights into this matchup. If you pay attention to the build and suggestions displayed above, you should grow your win rate significantly and be that much closer to League of Legends pro players.
Karthus usually picks up more CS compared to Sejuani. Champions who on average don't acquire many minion kills typically don't require much CS to be valuable teammates, such as sup champs. These kinds of champions are able to scale properly 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 best items to prioritize in your Karthus versus Sejuani build include Malignance, Void Staff, and Liandry's Torment. When Karthus combined at least these three items in his build, he performed significantly better when facing Sejuani than with many other commonly used item sets. In fact, Karthus boasted an average winrate of 47.4% when countering Sejuani with these items in his kit.
To have the highest probability of beating Sejuani as Karthus, Karthus players should equip the Dark Harvest, Cheap Shot, Eyeball Collection, Ultimate Hunter, Gathering Storm, and Transcendence runes from the Domination and Sorcery rune sets. Out of all the rune combinations players used for Karthus vs Sejuani counters, this combo of runes resulted in the greatest win rate. In fact, these runes gave a 47.4% win rate overall.
If you would like to see Karthus vs Sejuani tips and matchup stats and build suggestions for a a distinct rank, please select one from the selection menu shown above. If viewing for the first time, the statistics and strategies displayed are computed using every match finished with both champions.