For increased range and damage, try casting Shock Blast through the Acceleration Gate.
If you find yourself taking lots of damage, try using Jayce's Hammer Stance, as it grants you additional defenses.
Be sure to switch stances often. It will enhance your attacks and grant you quick bursts of speed.
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 provided here underscore some influential Jayce vs. Kayn counter stats that may help you grasp the differences and similarities between the pair. Jayce’s KDA ratio ([kills + assists] / deaths) of NaN is more than Kayn’s ratio of NaN, highlighting that Jayce may be more central to his team's team fighting capacity than Kayn..
Jayce often has a similar longest kill spree as his opponent does. Typically, he receives less damage than Kayn. This commonly reflects differing health capacities, yet it can also illustrate that the champion with higher health has less agility and thus is not able to kite away from additional damage when engaged or poked.
Both League champs are great champions. Both champs have their strengths, weaknesses, and counters. In the game's current meta, Jayce usually loses when trying to fight Kayn, with a 48.2% win rate. Therefore, Jayce makes a poor counter to Kayn.
While Jayce does have a lower winrate compared to Kayn, when they face off with one another, Jayce also has a lower difficulty level that makes him a less challenging champion to pick up and master. You still need to be cautious when picking Jayce into Kaynas his relative depth means that you may not be able to reach his full potential without a lot of practice beforehand.
Furthermore, Jayce has only a small 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 a single best champion overall in League of Legends, in Jayce vs Kayn matchups, Kayn is the better champ with a lower win rate, less champion complexity, and a similar amount of utility to help out your teammates during late stage team fights.
Jayce is a somewhat poor counter to Kayn. Focus your play on maximizing your gold income and destroying objectives. If you do that, you should hold your own as Jayce against Kayn.
If you would like to truly master Jayce to counter Kayn during both the laning and mid / late game phases of League of Legends, you should keep reading to gather a few extra lessons on this matchup. If you pay attention to the build and suggestions presented here, you should grow your win rate significantly and be that much closer to League of Legends pro players.
Jayce on average racks up much more CS compared to Kayn. Champs who on average don't take much CS usualy don't require much CS to be effective, such as supports. They are capable of scaling well off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, typically have to have several high cost items to be effective. In either case, try to do better than the values shown on this page to do well.
The top items to focus on in your Jayce versus Kayn build include Youmuu's Ghostblade, Serylda's Grudge, and Hubris. When Jayce bought at least these three pieces in his build, he did much better vs Kayn than with many other commonly used counter builds. In fact, Jayce had an average win rate of 48.2% when playing against Kayn with these items in his kit.
To have the best chance of crushing Kayn as Jayce, Jayce players should equip the First Strike, Magical Footwear, Biscuit Delivery, Cosmic Insight, Manaflow Band, and Transcendence runes from the Inspiration and Sorcery rune sets. Out of all the runes players used for Jayce vs Kayn face-offs, this mixture of runes yielded the best win rate. Notably, these runes gave a 48.2% winrate overall.
If you would like to get Jayce versus Kayn tips and counter stats for a an individual rank, please select one from the selection menu shown above. By default, the statistics and guides given are computed using all games run with both champs.