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 highlight some strategic Yuumi against Sejuani matchup stats that may help you understand the distinctions between the two. Yuumi’s KDA ratio ([kills + assists] / deaths) of NaN is more than Sejuani’s KDA ratio of NaN, showing that Yuumi may be more central to her team's team fighting capacity than Sejuani. This observation is in large part caused by the differences in assists.
Yuumi typically has a slightly smaller longest kill spree than her enemy does. On average, she receives less damage than Sejuani. This commonly reflects different amounts of tankyness; however, it can also imply that the one champ has less mobility and thus is unable to escape further harm when poked or engaged.
Both League of Legends champs are great. Both champs have their strengths, weaknesses, and counters. In the game's current meta, Yuumi usually loses when taking on Sejuani, with a 44.6% win rate. Therefore, Yuumi makes a bad counter to Sejuani.
While Yuumi does have a much lower win rate than Sejuani, when on opposite teams, Yuumi also has a lower learning curve that makes her a less difficult champ to learn and master. You should be very concerned when picking Yuumi into Sejuani.
Moreover, Yuumi has a lot of utility and CC, a similar amount to Sejuani. This often makes her just as valuable during teamfights, especially when fighting champions with a lot of burst damage.
While there is not a single best champion overall in League of Legends, in Yuumi vs Sejuani matchups, Sejuani is the better champion with a much lower win rate, less champion complexity, and a similar amount of utility to help out your allies during teamfights.
Yuumi is a trash counter for Sejuani. You will do well by focussing your play on increasing your gold income and clearing objectives. If you are able to do that, you should hold your own as Yuumi against Sejuani.
If you would like to learn all of the intricacies of Yuumi to counter Sejuani during both the laning 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 listen to the build and suggestions shown above, you will grow your win rate significantly and be that much closer to League of Legends pro players.
Yuumi on average picks up a lot less CS compared to Sejuani. Champs who on average don't take much CS typically don't require much CS to be effective, such as supports. They are capable of scaling properly off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, often need many items to be effective. In either case, try to surpass the values shown on this page to do well.
The best items to have in your Yuumi versus Sejuani build include Ardent Censer, Dream Maker, and Staff of Flowing Water. When Yuumi used at least these three pieces in her build, she performed a lot better countering Sejuani than with many other common item sets. In fact, Yuumi had an average win rate of 44.6% when playing against Sejuani with these items in her kit.
To have the greatest probability of annihilating Sejuani as Yuumi, you should take the Summon Aery, Manaflow Band, Transcendence, Scorch, Font of Life, and Revitalize runes from the Sorcery and Resolve rune sets. Of all the rune combinations players used for Yuumi vs Sejuani fights, this sequence of runes yielded the best win rate. Moreover, these runes provided a 44.6% winrate overall.
By default, tips, statistics, and builds on how to beat Sejuani as Yuumi are shown for all ranked divisions combined. If you would like to narrow the statistics and builds to an individual division, you should use the selection menu located at the top of this page.