Kassadin's ultimate has many uses and is on a shorter cooldown than most, use it often.
Kassadin has multiple item paths; he can go caster via Mana and Ability Power or anti-caster with Cooldown Reduction and Magic Resist.
Try to get the Ancient Golem buff to counteract Riftwalk's increasing Mana cost.
The stats shown on this page clarify some significant Kassadin against Zeri matchup stats that can help us understand the distinctions between this set of champions. Kassadin’s KDA ratio ([kills + assists] / deaths) of NaN is more than Zeri’s KDA ratio of NaN, indicating that Kassadin may be more central to his team's team fighting potential than Zeri..
Kassadin typically has a similar longest killing spree as his foe does. On average, he receives more damage than Zeri. This typically indicates differing health capacities, yet it can also imply that the one champ has less agility and thus is not able to kite away from further damage when poked or engaged.
Both League champs are great champions. Both champs have their strengths, weaknesses, and counters. In the game's current meta, Kassadin usually loses when taking on Zeri, with a 47.0% win rate. Therefore, Kassadin makes a poor counter to Zeri.
While Kassadin does have a lower winrate than Zeri, when on opposite teams, Kassadin also has a greater level of difficulty that makes him a more time consuming champ to learn. You should be very concerned when picking Kassadin into Zerias his relative depth means you may not be able to reach his full potential without a significant amount of practice beforehand.
Additionally, Kassadin has some amount of CC and other utility, a similar amount to Zeri. This often makes her just as valuable during team fights, especially when facing champions with a ton of burst damage.
While there is not one best champion in League of Legends, in Kassadin vs Zeri matchups, Zeri is the better champ with a much lower win rate, more champion depth, and a similar amount of utility to help out your teammates during late stage team fights.
Kassadin is a bad counter to Zeri. Focus your tactics on maximizing your CS and destroying objectives. If you do that, you should do very well as Kassadin against Zeri.
If you would like to truly master Kassadin to counter Zeri during both the early game and mid / late game phases of League of Legends, you should keep reading to pick up a few extra tips and tricks for this matchup. If you pay attention to the build and suggestions displayed here, you will increase your win rate significantly and be closer to League of Legends pro players.
Kassadin on average accumulates a similar amount of CS compared to Zeri. Champs who typically don't take many minion kills often don't have to have much CS to be effective, such as support champions. These kinds of champions are able to scale well off of their skills, stats, and first items alone. Yet, champs with a lot of CS, such as hyper-carries, typically need several high cost items to be effective. In either situation, try to do better than the numbers shown here to do well.
The best items to use in your Kassadin versus Zeri build include Seraph's Embrace, Rabadon's Deathcap, and Rod of Ages. When Kassadin included at least these three items in his build, he performed much better vs. Zeri than with many other typical counter builds. In fact, Kassadin boasted an average win rate of 47.0% when countering Zeri with this counter build.
To have the best likelihood of crushing Zeri as Kassadin, Kassadin players should take the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Sudden Impact, and Ultimate Hunter runes from the Inspiration and Domination rune sets. Out of all the rune builds players picked for Kassadin vs Zeri counter picks, this sequence of runes resulted in the best win rate. In fact, these runes averaged a 47.0% win rate overall.
By default, tips, statistics, and builds on how to beat Zeri as Kassadin are shown for all ranked divisions combined. If you want to scope the stats and builds to an individual division, you can use the selection menu located earlier on the page.