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Hi there! I've been playing Yuumi occasionally, and since her rework on patch 13.5, I've been spamming her in solo q, and these are the conclusions I've come to! Mostly runes, itemization, and explanations behind my choices. Thank you for reading!

If you're interested in my other guides:
Karma - Support Karma
Ashe - Support Ashe
Soraka - Support Soraka
Amumu - Support Amumu
Miss Fortune - Support Miss Fortune
Trundle - Support Trundle
Veigar - Support Veigar
Jarvan IV - Support Jarvan
Pantheon - Support Pantheon
Heimerdinger - Support Heimerdinger
Sona - Support Sona

Pros:

- Pairs extremely well with Attack-Speed focused ADC's.
- Can focus on other parts of gameplay without worrying about positioning.
- A vast majority of players absolutely hate playing against her, which can give you the mental edge.

Cons:

- Getting CC-ed outside of laning phase pretty much means you die.
- If your lane partner is not doing well, it will be harder to be impactful in the game.
- You won't have much roaming potential as you have almost zero reason to buy shoes.
- Only really pairs with ADCs, and not mages.

There's two main mythics to buy, and depending on which one you buy, you will max the coresponding skill first to increase the potency of your mythic power spike. For Q - Prowling Projectile buy Shurelya's Battlesong and for E - Zoomies buy Moonstone Renewer.

Mythics

Reasons to get Moonstone Renewer (with Zoomies max)
- If your adc won't have too hard of a time positioning in team fights, then amplifying all the healing/shielding you're doing will be amazing. Usually champions with dashes like Lucian or Tristana it will be very nice on.
- If you're the only person on your team healing and shielding, then this will also be much more appealing since your opponents may purchase heal/shield cut. It would make your opponent's purchase not as valuable since it would hinder just you and not your team mates.

Reasons to get Shurelya's Battlesong (with Prowling Projectile max)
- Your lane partner doesn't have many movement options.
- Your team loves to run at the enemy, such as Rammus or Hecarim.
- Much stronger chase potential with more uptime on Prowling Projectile.
- A lot of your team mates already heal inherently such as Sylas or Aatrox.

Boots/Shoes Choice

- Don't buy them

Legendaries

Chemtech Putrifier
- You can usually sit on Oblivion Orb until you have nothing better to complete for an item.
- If your opponents have excessive healing outside of their items, such as Sylas Soraka Aatrox, then this will be valuable purchase.

Mejai's Soulstealer
- If you and your lane partner are doing very well, then you can definitely look to pick this up, but only after you have purchased your mythic.
- If your lane partner is not doing well, then finish your other legendary items.

Mikael's Blessing
- This will create a LOT of safety for your lane partner and allow them to play much more aggressive.
- Particularly on Yuumi, since you are almost always untargetable, and if your host dies, you're likely dead too; there could be a case in which you can use this as a Cleanse. Here's an example of that Mikaels as Cleanse

Staff of Flowing Water
- Overall a safe purchase if nothing else looks too appealing. Can't go wrong with all the stats this item provides to yourself and your host.
- Works nicely with Font of Life

Ardent Censer
- I usually don't end up buying this item in general, because if your ADC isn't doing too great, it ends up being a relatively weak buy.
- The only reasons why I'd buy Ardent Censer, is because I have at least another ranged Auto-Attack focused carry on my team ( Kayle, Corki, Graves, Kindred etc etc). AND/OR your hypercarry is really fed.
- Works nicely with Font of Life.

TLDR; Hopefully you have a good adc.

Passive - Feline Friendship

- If you cannot land Prowling Projectile during laning phase, you will need to detach to auto attack an enemy champion just once, and then re-attach to get your healing. This is so that you can heal your lane partner.
- Once you have Final Chapter, you have almost zero reason to ever dismount to proc this passive as Final Chapter has such a huge hit-box.

Q - Prowling Projectile
- While attached, it becomes almost impossible to land this if your opponents stand directly behind the minion wave as this will usually accelerate too quickly before you can get the angle to hit them.
- If you have a lane partner in which your opponents don't like standing behind minions like Miss Fortune and her Double Up or Xayah and her passive auto attack following through minions, then you will have more opportunities to land Prowling Projectile.
- Don't always aim to land the empowered Prowling Projectile. Just landing this at all will give your lane partner the bonus on-hit damage.
- This has extremely strong chasing potential, and it reaches VERY far when fired in almost a straight line.

W - You and Me!
- This will be the main difference maker between a good Yuumi and a bad Yuumi. Knowing when you have an opportunities to detach, to body block abilities, or soak as much damage as possible before escaping into a host with a sliver of health.
- Keep an eye on all abilities that can inturrupt you and either wait for them to be on cooldown, or bait enemies to try and use them on you while being detached, and then re-attaching before you are hit.
- While detaching, you actually dismount slightly towards your own base, and this small distance can be the difference between blocking an ability successfully, or your team mate getting hit by the splash damage anyways.
- If your lane partner wants to push the wave, you will need to detach to auto-attack the minion wave. In follow-up, if your lane partner recalls in close proximity to you, you can do a handful of things before attaching to their recall. Dropping a ward in a brush or using Prowling Projectile or getting Spellthief's Edge stacks if you're both close enough to the enemy turret.
- Unless you are trying to maintain the wave state, it's almost always better to be attached to your lane partner as they are very likely your Best Friend and giving them on-hit healing is nice.

E - Zoomies
- To push a minion wave the fastest, use Zoomies on your lane partner to give them attack speed, then detach and begin auto-attacking the minion wave.
- This gives mana to your host, and increases based on MISSING mana. So keep an eye on any of your team mates who may need mana to cast a crucial ability, such as Karthus who may want to use Requiem on someone across the map but doesn't have enough mana to use it. This is currently the only ability in the game that can give your team mates mana, so it is very unique to Yuumi.
- If you are walking from base, use this to get back to lane or anywhere faster; assuming you won't immediately be getting into a fight. Especially do this if you have Shurelya's Battlesong.

R - Final Chapter
- Using this as an anti-burst ability is very strong, since you grant an over-shield if your Best Friend is full hp, cast Zoomies during the channel which makes your shield AND procs your passive that gives more healing.
- This will proc Shurelya's Battlesong on all your team mates it touches.

TLDR; Aery. If you take comet; go Precision and build Shurelya's Battlesong and max Prowling Projectile first.

Summon Aery
- It's just good. Everything else sucks.

Arcane Comet
- In a very very few scenarios in lane match-ups where you can almost always hit Prowling Projectile then take this.
- To be done with maxing Prowling Projectile first.

Manaflow Band
- Good rune, nothing else to take.
- Try to line up the cooldown with your Prowling Projectile

Transcendence
- Pretty good overall, can't go wrong with ability haste, and since you're almost always in lane, you'll likely level up faster than the enemy support since they may try to roam.

Absolute Focus
- If you have Arcane Comet then this may be much more appealing.
- Max Prowling Projectile first.

Scorch
- Overall a safe rune, just a bit more potent poke.

Gathering Storm
- If you think landing Prowling Projectile in laning phase will be difficult, then this will do wonders.

Font of Life
- While yuumi doesn't have a lot of hp, it still procs fairly often, especially once you have Final Chapter in team fights.

Revitalize
- Amazing. Gives everything you want.
- Stack this with Moonstone Renewer

Presence of Mind
- Take this with Shurelya's Battlesong, for constant team fight chasing pressure.

Cut Down
- Since Yuumi has very little hp at all points in the game, this will usually add a lot more potency to your damage.
- If your opponents have a lot of tanks or melee champions, this will look a lot more appealing.

Laning Phase/Early Game

There are two parts to this: If you lane vs an all-in and lane vs ranged

Vs Ranged
- Start with Spellthief's Edge and two Health Potion.
- Because You and Me! can't be inturrupted very easily, you should occasionally look to auto-attack with your adc to stack Spellthief's Edge and make use of your Health Potion so you don't lose all of your lane pressure.
- Keep an eye on when your enemies try to trade with your lane partner and use Zoomies to block the damage so that you can win the trade.

Vs Melee
- Start with Spellthief's Edge and Control Ward.
- Look for an area in which you can place the Control Ward without it being cleared out too early/quickly.
- Until your enemy cannot inturrupt You and Me! or if you need to push the wave, you should not detach, and just be ready to react to the enemy follow-up if they all-in your lane partner. Most of the time, you will be using Exhaust on the person that will do the most damage to your lane partner. And if you think your opponents will use Ignite then try to Heal before that.

In General:
- Keep track of how many non-offensive summoner spells you and your opponents have in your lane. Mostly Exhaust Ignite and Heal, and whichever side has more, is much more likely to win the 2v2. Since you never have Flash and if your lane partner took Heal or Exhaust, then you're usually good to go if they decide to fight you 2v2.
- Keep your recall timings with your lane partner as much as you can as they are essentially your transportation vehicle and you will very rarely ever roam to an objective. If you have a really good purchase to make or you're sitting on a lot of gold, you can try to convince your lane partner by pinging your gold or item you can buy.

Mid/Late Game

- Your lane partner is very likely your Best Friend, and unless you sit on someone else for 10 minutes, this will not change.
- To ward; look for opportunities to go on your Jungler as they are much more likely to be in positions that you want to ward or maybe even fight an enemy. These opportunities include when you're usually around mid-lane and your jungler is crossing over from their bot side to top side jungle, or they're looking to go into the river and/or enemy jungle.
- If your Best Friend is under no threat from your enemies, then you can look to sit on someone that's in the front lines, as you can use Zoomies to block the damage on them while also look to chase/engage or pick someone off.
- If your Best Friend has multiple threats, then keep sitting on them and be ready to react with Final Chapter and your summoner spells, especially Exhaust if you have it.

Grading Explanation below the lists! Check the RANK too!

- On this patch, she got hit quite hard with the nerf bat, so she's gone from being insanely overtuned into being playable with the right lane partners and against certain team comps.

13.6 Plat and Below
13.6 Diamond+


Tier List Grading Points

- Winrates
- Champion Difficulty (more relevant in platinum and below)
- Counter-play (more relevant in platinum and below)
- Flex pick for draft (more relevant in diamond+)
- Early game (more relevant in diamond+)
- Late game/scaling (more relevant in platinum and below)

Overall Points:

- Games last longer the lower in elo you go. Therefore, mage supports tend to do much better since you can buy your items, and you basically become another carry threat. This leads to enchanters/engage being weaker in lower level play since you would rely on your teammtes more often.

- Champions that are fundamentally easier to execute on will have higher win rates. Since it is more unlikely players are pilot-ing their champion runes/builds/kit efficiently, the easier the champion, the more likely to maximize their kits. This is especially apparent in Platinum and below.

- I would recommend playing any of the champs in S+, S, or A. However you can climb on almost anything, provided you always look to maximize your champion kit, mechanics, and impact on the game. Winning is the result of improving.

If you have any questions, leave a comment below! I'll be editing this as I go and be sure to let you know once I have more updates. Or if you'd like to ask me a question directly, you can go to my twitch stream! twitch.tv/navcan

There's also my tiktok
And my youtube!

Cheers and thank you for reading! Good luck on the rift