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 stat comparisons provided here highlight several influential Vex versus Kayn counter statistics that can help us figure out the differences between the two. As an example, Vex’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Kayn’s ratio of NaN, highlighting that Vex may be more central to their team's team fighting potential than Kayn..
Vex typically has a similar longest killing spree as their enemy does. Typically, they receives less damage than Kayn. This is usually reflective of different amounts of tankyness, yet it can also indicate that the champ with higher health has less mobility and thus is not able to escape additional damage when poked or engaged.
Both League champs are great. Both champs have their pros and cons. In League's current meta, Vex usually fairs equally well when taking on Kayn, with a 50.5% win rate. Thus, Vex makes an ok counter to Kayn.
While Vex does have a higher winrate than Kayn, when facing one another, Vex also has a much lower learning curve that makes them a less time consuming champion to pick up and master. You should be careful when picking Vex into Kayn.
Additionally, Vex has some amount of CC and other utility, a similar amount to Kayn. This makes her just as valuable during teamfights, especially when fighting champions with a ton of burst damage.
While there isn't one best champion in League of Legends, in Vex vs Kayn matchups, Vex is the better champ with a similar win rate, less champion complexity, and a similar amount of utility to help out your teammates during team fights.
Vex is a decent counter to 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 Vex against Kayn.
To truly master Vex in order to counter Kayn during both the lane and mid / late game phases of League of Legends, you should keep reading to learn a few extra tips and tricks for this matchup. If you pay attention to the build and tips displayed above, you will increase your win rate significantly and be that much closer to League of Legends pro players.
Vex often accumulates much more CS as Kayn. Champions who typically don't take much CS often don't require much CS to be valuable teammates, such as supports. These kinds of champions are able to scale properly off of their skills, stats, and first items alone. Yet, champions with a lot of CS, such as hyper-carries, usually have to have a lot of items to be effective. In either case, try to exceed the numbers shown here to do well.
The ideal items to focus on in your Vex versus Kayn build include Rabadon's Deathcap, Shadowflame, and Stormsurge. When Vex combined at least these three pieces in their build, they performed much better when fighting Kayn than with most other common builds. In fact, Vex had an average win rate of 50.5% when countering Kayn with this build.
To have the highest probability of defeating Kayn as Vex, you should take the Electrocute, Taste of Blood, Eyeball Collection, Ultimate Hunter, Manaflow Band, and Transcendence runes from the Domination and Sorcery rune sets. Out of all the rune sets players used for Vex vs Kayn clashes, this sequence of runes yielded the greatest win rate. Notably, these runes averaged a 50.5% win rate overall.
By default, tips, stats, and builds on how to beat Kayn as Vex are shown for all skill levels combined. If you want to narrow the stats and builds to a distinct rank, you should use the selection menu located earlier on the page.