Rhaast is extremely good for team fighting and doesn't need to get fed to make an impact on the game. On the other hand he is not good at diving backline nor great at dealing with mobile adcs like vayne

Shadow assassin is mainly good at making picks to win team fights. like picking off the enemy adc before drake fight. He is mainly countered by hard cc, and isn't amazing in team fights with a regular assassin build.

Rhaast Deals max health % damage so it is always good to pick rhaast into 3 or more tanks he also does quite well against skirmishers like yone and bruisers like jax. an easier way to pick for new players is based off if they are melee or ranged

Shadow Assassin is really good against squishes so it is always good to pick blue into 3 or more squishes or people who stack damage over health. an easier way to pick for new players is based off if they are melee or ranged

^^^ an Outdated but still very helpful of which champs are ranged and melee

Kayn's best clear atm would be

Red Brambleback → Krugs → Crimson Raptor → Greater Murk Wolf → Blue Sentinel + Gromp

You can do this before 3:15 with practice and a leash
The advantage to doing this before 3:15 is you can get scuttle bug or lead that into a gank on mid/top or mid/bot

A very good teamfighting item if you are not running Goredrinker Very easy to reset your passive and make the next pick would rate it a 9/10 item since it stacks ability haste instead of lethality which makes your one shot a little worse

Very Good since you can combo very easily with, It gives you more mobility, And to top it off you get 15% more damage on whoever you use the active on. Super easy to combo, simply W > Prowlers > Q > Auto > Ult 8/10 since you won't get as much teamfight out of it as you do with Goredrinker or Duskblade of Draktharr

Good for teamfight sustain on both forms. Not as good on Blue Kayn in my opinion since the damage nerfs but still a viable option. Rhaast is now Really good as of 11.22 since his damage and healing now just went up.

Not even gonna lie , I only use this mythic if I mess up my form with Blue Kayn runes on Rhaast. Haven't seen anybody run this for a while . Gave good sustain 7/10

Very good item if ahead and looking to one shot faster. Crit is a nice bonus and would recommend it IF ahead since it won't do you much if you are really behind. the only way I see you taking this if you are behind is if you play exclusively for picks on very squishy / immobile champs but even then it's not an amazing item when behind

Extremely good item ahead or not. Offers Lethality and keeps you alive for a little longer so you don't get CC'd or one shot if you mess up. I build this almost every game I see an opportunity in and it makes it much easier to make picks.

Very strong and consistent item. It gives you the highest base lethality out of any legendary item, ability haste and increases your speed with active and passive. Probably one of the best items on Blue Kayn since it's buff

Formerly the highest lethality item on Blue Kayn. You take this into shields like Karma, Yas, Or if they just have lots of shield bows. not much else to say since other than bonus AD you really only get the shield passive out of it now

Tear in general is very nice on Kayn for both forms since it allows you to spam abilities more. For high MS builds. I always take tear mainly because E spam is very mana consuming and it's always nice to just have a little more mana. I usually don't finish this until 5th or 6th item unless the tear is fully stacked.

A rush item when they have 2 tanks. Since you use it does % armor pen so against tanks like Sion or Rammus This item is very good. The passive slow is also good incase you don't one shot and don't wanna use anything else to gap close.

Very good if you want extra cdr on ult if not running Ultimate Hunter As of right now I can't 100% recommend it as I have played 1 game with item

A very situational item when you want to deny vision nearly everywhere. Combos really well with zombie ward and ingenious hunter. Note: you will out vision score the support. in 30 min games I managed to get over 70+ vision score

Sterak's are always a nice option to have ahead or not since it allows you to have a much better team fight and improve your already nuts team fight on Rhaast. I very much recommend you take this after very profitable team fight or in 1v9 situations.

As of 11.22 this item is very good on Rhaast since it offers damage and more sustain in to AD heavy teams. This + sterak's = alive forever and the more your alive the more you can shred enemy team. AD heavy teams will start bursting tears if you build this item

Not much to say the MR healing combo is very nice and item passive is broken abuse to your hearts content against very heavy AP teams. Don't recommend taking this item for it's passive only tho as un-needed MR will leave in a very bad situation with A full AD team or fed fighter.

If you loved damage on Rhaast, prepare to have all enemy tanks cower to you as sustained fights won't be an option for them. You have EVEN more damage and shred more armor as time goes on. Recommend taking this into teams that like to stack armor or very heavy tanks like Sion or Cho'Gath

Very standard Grievous Wounds. Take into teams with lots of or mostly Life Steal or OmniVamp. champs that have lots of or good base healing include Lee Sin, Darius, Soraka, Irelia, Aphelios etc.

Very aggressive item in the rare case the enemy was struck in the head with a coconut and forgot what Grievous Wounds are. Very good for you if the enemy does not know how to counter build. The passive is okay. but not exactly worth the 3300 price tag.

Runes on Kayn are really split on what build you are going to run. For example on Blue Kayn you CAN take Ultimate Hunter and build Prowler's Claw or you can take Ingenious Hunter and have a Shorter CD on your Prowler's Claw

Also please feel free to try any combination of runes or build you might think work as Kayn in general is a very flexible champ in terms of build. One guy that has plenty of fun builds to try and way better than me is Karamsmai on Twitch and Youtube

Conq is very standard on Rhaast even after nerfs. As extended fights are what he loves to take and will get the most benefit out of. In team fights this rune is extremely good at stay alive and being a strong and powerful frontline for your teammates.

Very good at keeping you alive for 2 things. Tower dives when you might find yourself in a bad situation but pick up a kill anyways. And Very close

You Might be thinking you get more use out of Legend: Bloodline But Rhaast is very easily counter built and the extra healing in my opinion is less important than the Tenacity since you will be able to do more as a front liner. Also this makes early game ganks a lot more smooth as the slim CC reduction is very nice.

You will be on low health nearly the entire fight and it's very good to deal more damage for more healing when lower. not much else I can explain here.