When Kayn is in terrain near you, you will get a visual warning on the edge of the terrain he's in.
Umbral Trespass requires Kayn to damage a target first. Try to dodge Blade's Reach to deny him a long range cast of Umbral Trespass.
Damage Kayn while he's in Shadow Step to shorten its duration, or apply hard crowd control (stun, charm, knockup, etc) to end Shadow Step immediately.
The stats shown on this page clarify some significant Zeri vs. Kayn matchup stats that can help you figure out the differences between the two. For instance, Zeri’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Kayn’s ratio of NaN, indicating that Zeri may be more central to their team's team fighting capability than Kayn..
Zeri normally has a similar longest killing spree as their foe does. On average, they takes less damage than Kayn. This is usually reflective of different amounts of tankyness; however, it can also indicate that the one champ has less agility and thus is not able to escape further damage when engaged or poked.
Both LoL champions are great. Both champs have their strengths, weaknesses, and counters. In League's current meta, Zeri usually loses when trying to fight Kayn, with a 47.7% win rate. Therefore, Zeri makes a poor counter to Kayn.
While Zeri does have a lower winrate than Kayn, when they face off with one another, Zeri also has a lower level of difficulty that makes them a less complex champion to pick up and master. You may get destroyed when picking Zeri into Kayn.
Additionally, Zeri has some amount of CC and other utility, a similar amount to Kayn. This makes her just as valuable during team fights, especially when fighting champions with a ton of burst damage.
While there is not one best champion for every situation in League of Legends, in Zeri vs Kayn matchups, Kayn is the better champion with a lower win rate, less champion complexity, and a similar amount of utility to help out your allied champions during late stage team fights.
Zeri is a garbage counter for Kayn. You will do well by focussing your play on maximizing your CS and clearing objectives. If you do that, you should do very well as Zeri against Kayn.
To truly master Zeri to counter Kayn during both the early game and mid / late game phases of League of Legends, you should continue reading to learn a few extra lessons on this matchup. If you pay attention to the build and tips shown here, you will increase your win rate by a lot and be that much closer to League of Legends pro players.
Zeri often gets much more CS relative to Kayn. Champions who on average don't get many minion kills often don't need much CS to be valuable teammates, such as support champions. These kinds of champions are capable of scaling properly off of their skills, stats, 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 do better than the values reported on this page to do well.
The most important items to prioritize in your Zeri versus Kayn build consist of Experimental Hexplate, Runaan's Hurricane, and Terminus. When Zeri bought at least these three pieces in their build, they performed a lot better versus Kayn than with many other typical counter builds. In fact, Zeri had an average win rate of 47.7% when countering Kayn with this build.
To have the greatest likelihood of vanquishing Kayn as Zeri, Zeri players should take the Lethal Tempo, Triumph, Legend: Alacrity, Last Stand, Conditioning, and Overgrowth runes from the Precision and Resolve rune sets. Out of all the rune builds that we analyzed for Zeri vs Kayn counterpicks, this composite of runes yielded the greatest win rate. In fact, these runes gave a 47.7% win rate overall.
By default, tips, statistics, and builds on how to beat Kayn as Zeri are shown for all ranked divisions combined. If you want to narrow the stats and builds to a specific skill level, you should use the selection menu earlier in the counter matchup guide.