It takes 6 spell casts for Kassadin's slow, Force Pulse, to become castable. If he levels up that ability, judiciously use your own skills while laning against him.
Kassadin deals mostly magic damage. If he's doing well consider buying magic resist items like Mercury's Treads and Banshee's Veil.
Each time Kassadin consecutively uses Riftwalk, he pays more and more mana. Keep this in mind as you chase him.
The stat comparisons provided here clarify some important Zeri vs. Kassadin counter statistics that may help us realize the differences between the two. For instance, Zeri’s KDA ratio ([kills + assists] / deaths) of NaN is better than Kassadin’s ratio of NaN, showing that Zeri may be more central to their team's team fighting capacity than Kassadin..
Zeri often has a similar longest kill spree as their enemy does. Typically, they takes less damage than Kassadin. This commonly reflects differing health capacities, but it can also show that the one champion has less agility and thus is unable to kite away from additional harm when engaged or poked.
Both League champs are great. Both champs have their pros and cons. In League's current meta, Zeri usually wins when taking on Kassadin, with a 53.0% win rate. As a result, Zeri makes a good counter to Kassadin.
While Zeri does have a higher winrate compared to Kassadin, when on opposite teams, Zeri also has a lower level of difficulty that makes them a less complex champ to learn and master. You should be be fine when picking Zeri into Kassadin.
Furthermore, Zeri also has some amount of CC and other utility, a similar amount to Kassadin. This often makes her just as valuable during teamfights, especially when fighting champions with a lot of burst damage.
While there is not one best champion in League of Legends, in Zeri vs Kassadin matchups, Zeri is the better champ with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your allies during late stage team fights.
Zeri is a good counter for Kassadin. Make sure you focus your actions on maximizing your gold and cs and destroying objectives. If you are able to do that, you should be able to stand on your own as Zeri against Kassadin.
If you would like to truly master Zeri in order to counter Kassadin 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 stats presented here, you will increase your win rate by a lot and be closer to League of Legends pro players.
Zeri typically accumulates a similar amount of CS relative to Kassadin. Champs who on average don't take many minion kills often don't need much CS to be effective, 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, typically have to have many items to be effective. In either situation, try to do better than the values shown here to do well.
The best items to have in your Zeri versus Kassadin build include Experimental Hexplate, Runaan's Hurricane, and Titanic Hydra. When Zeri bought at least these three items in their build, they did a lot better vs. Kassadin than with most other typical builds. In fact, Zeri boasted an average win rate of 53.0% when playing against Kassadin with this counter build.
To have the greatest chance of crushing Kassadin as Zeri, you should use the Lethal Tempo, Triumph, Legend: Alacrity, Last Stand, Conditioning, and Overgrowth runes from the Precision and Resolve rune sets. Of all the rune combinations players picked for Zeri vs Kassadin clashes, this composite of runes yielded the greatest win rate. In fact, these runes averaged a 53.0% win rate overall.
By default, tips, statistics, and builds on how to beat Kassadin as Zeri are displayed for all ranked divisions. If you would like to scope the stats and builds to a specific division, you can use the selection menu located earlier on the page.