Quite strong with his E mechanic which allows him to gank both bot and top lane relentlessly. It allows him to get his desired Passive form with ease.
He is quite versatile and can play around what his team needs. If his team happens to have a lot of damage, he can go for the Darkin form and act as a front line for his team.
If he takes the Assassin form, he can easily one-shot targets in the enemy backline. With the E movement speed, he can quite easily run them down.
He is very dependent on playing around his Passive before he gets his form. If he happens to get the wrong form early on, he will be set back massively.
With his Ultimate R, he becomes completely reliant on the positioning of the target he is in. If the target takes him under their tower and CC’s them, he will take a lot of damage.
His E can be interrupted. This allows the enemy team to put him in a very disadvantageous position which can actually get him killed immediately.
0 - 15 min
Kayn is a skirmish heavy Jungler. Look to fight and duel people often in the early game.
Get your transformation as quickly as possible. Regardless of what transformation you want, you need to get it as quickly as you can. This can be achieved by fighting often.
Kayn has good objective control. Try to secure objectives as often as possible in the early game.
15 - 25 min
Look to assassinate targets that are walking around Summoners Rift alone. Your champion is really good at blowing somebody up, so try your hardest to increase your lead by getting picks.
In team fights, look to flank and blow up the squishiest enemies. Attacking from the side rather than running directly at the enemy will be your go-to plan in team fights.
Focus on securing objectives like the Dragon and Baron in the mid game. As you’re the Jungler, make sure you make the call for the objective when necessary.
Peel for your allies in the late game, especially if you’re Red Kayn. Keeping them alive and focusing the champion they’re focusing will increase your chances of winning the fight.
Group with your team in the late game. You can play off to the side slightly if you’re ahead and are able to assassinate someone.
Continue to focus objectives like the Baron or Dragon. Getting a pick could provide you with enough time to do the Baron.
His objective control is powerful in the Jungle. This is due to his increased clear speeds and his ability to walk through walls when needed. This allows him to take odd Jungle paths.
Level six is a decent power spike as it allows him to become invulnerable for a while. It becomes stronger once he manages to get his form.
The first component will give Kayn a massive powerspike as it will bolster both his damage and survivability. It will allow him to duel enemies with ease.
Once Kayn gets 2 points in his Ultimate R, he will be able to all-in enemies much more frequently. It will be perfect since he will also get his form.
His Q will be maxed out at level 9. This is really helpful for him as it is his paramount damage ability. It will allow him to dish out a lot of damage and kill squishies and tanks (depending on his form).
During the mid-game, he should be able to get multiple picks on the enemy team. Since the enemy team will be in disarray, securing picks will become very easy for Kayn, especially on the enemy Support.
At level 16, Kayn will have his Ultimate R maxed out completely. This will directly fortify his ability to all-in enemies and kill them due to his burst damage.
Kayn will have multiple items by now. This is good for him, depending on his form. He can assassinate people if he goes for the Blue Form, while he can act as a frontline if he goes for the Red Form.
Depending on the form and build, Kayn will either be a killing machine due to his burst damage or a tanky, unkillable frontline who will easily peel for his carries.