Im kinda new to LoL, I started in 2022 in March, and I started playing Kayn same month. Tbh in starts I was terrible Kayn lmao, not like im not bad now but it's a lot better. Im making this guide so you can get better with this amazing champ too.

Kayn Positives:

» High mobility

» High damage

» Very universal bcs of forms you can choose

» Very nice gank potential due to his E

» Most beautifull skin in game (Snow moon kayn)

Kayn Negatives:

» Weak early game

» Can be easily kited

» You need to understand him

You may be wondering if its even so important to think about it, but trust me its key thing to do. Dont wait to game, you have to choose in champion selection, because each form has its own runes. You can you the first runes in this guide but it wont be as good as with the form runes, these are jsut universal.

So basicaly, if enemy team has 2 or more bruisers or tanks, pick Rhaast.

Rhaast is more team fight choose due to his pasive abbility The Darkin Scythe. After you get your Goredrinker and Steraks gage, they will have really hard time killing you.

If enemy team has 3 or more squishie, pick Assassin.

Assassin due to his pasive abbility The Darkin Scythe: Shadow Assassin is best for catching offlane enemies, and quick engage and kill.

But this form falls off in late game.

I've been trying this pick for quite some time on my second accounts and its pretty good. Kayn is mid game beast and has also pretty strong early lane.
If you dont get counter picked its practically free lane. Second you turn into Rhaast you gain so much power that you can surprise kill almost everyone even if you are behind.

You can go either Bruiser of AD build which both of these are very strong.
Tankiness of enemy toplaner can be easily solved with rhaast max health dmg on Q and black cleaver synergy, and other times you can juts go Eclipse and decimate them.

Curent Assasin mythic items are in really best spot. Basically you take only the one item that is curently ymost broken.
As of 13.21 its Youmuus Ghost blade because as i said it gives you 17 lehtality as passive and around 21 ad as passive.