Hey, my name's Larmack, and I'm a Challenger Yuumi OTP on the NA server. This guide will teach you everything you need to know about runes, itemization, and skill order for Yuumi. If you have any questions about anything, feel free to join my Discord or just ask me on stream at twitch.tv/larmack.

SUMMONER SPELLS - IGNITE/EXHAUST: You'll run this pair most games. This gives you a really strong all-in, as Exhaust+ Ignite will gut their healing (countering Heal), slow them to prevent them from running, and reduce their damage to prevent them from turning the fight. The only reason not to run this combo is if your ADC does not take Heal, and even then it's still usually the best option. HEAL/EXHAUST: Into harder matchups where you really don't have any kill pressure, you can opt for the triple defensive Heal + Exhaust + Barrier/ Cleanse/ Teleport on your ADC. This will make laning a lot safer in exchange for a significantly reduced kill threat pre-6. If your ADC runs Teleport especially, you should look for this double defensive option. You won't have the combat summoner spell advantage that usually comes with picking Yuumi, so you shouldn't be looking for pre-6 all-ins anyway. HEAL/IGNITE: This combo is a little weird and definitely the least common. You'll generally only run this because your ADC takes Exhaust and you have nothing else to take, or as an alternative to Heal + Exhaust when the early healing reduction is more valuable than the 30% slow and 40% damage reduction that Exhaust provides.

KEYSTONE Summon Aery: This is by far the best keystone on Yuumi. It gives your Q more oomph in lane and provides a meaningful shield that's easy to proc with You and Me! and Zoomies. It also puts you in the Sorcery tree which has a lot of solid minor runes for Yuumi. MINOR RUNE Manaflow Band: The extra 25 mana for each Prowling Projectile you land allows you to spam Qs much more in lane. This rune also provides a little extra mana regen at max stacks, and although it slightly increases the Zoomies mana cost, it's well worth the tradeoff. MINOR RUNE Transcendence: Ability haste is very strong on Yuumi, especially later on as you'll actually be casting abilities as they come up (unlike in lane). The Moonstone build also doesn't give a ton of haste on its own, so the extra 10 AH provided by this rune is very helpful. Absolute Focus: Absolute focus is also a viable alternative here. It's really easy to stay above the 70% hp cutoff because of your untargetability, so you have a lot of uptime on that extra AP. However, because Yuumi's AP ratios are pretty small, I generally opt for transcendence unless I'm planning on building a lot of ability haste that game. MINOR RUNE Gathering Storm: Gathering storm does nothing to help with your weak early game but provides a ton of free stats later on, making Yuumi into an absolute menace past 30 minutes. You should default to this unless Scorch will affect the lane matchup. Scorch: Scorch is a potential option if you're in a matchup where your opponent can't stop you from whittling them down with your Qs. If they have shielding/healing though (e.g. Karma Inspire or Nautilus Titan's Wrath), you generally aren't going to be able to do much with the extra bit of damage since they will just block/sustain most of it anyway. Only take this if the early damage will actually affect the lane since its damage falls off pretty quickly as the game progresses. MINOR RUNE Presence of Mind: This rune is basically mandatory on Yuumi. PoM provides a little bit of extra mana regen in lane, but where it really shines is in teamfights, where it gives you enough mana for an extra cast of Zoomies for every takedown your team gets. Even with PoM, Yuumi has insane mana problems, so attempting to play her without this rune is just putting yourself at a huge disadvantage. MINOR RUNE Cut Down: Since you're forced into the Precision tree for Presence of Mind, this rune is the next best minor rune for Yuumi. Due to your low base hp, you'll get a small boost to all your damage which definitely adds up as the game goes on.

Note that for your shards, you'll always want Diamond Diamond and Shield/ Circle. The extra ability haste from Time does nothing for you in lane. You don't have the mana to spam Zoomies and you generally want to wait for your Manaflow Band before using Prowling Projectile rather than using it off cooldown. Avoid taking Heart as it has anti-synergy with Cut Down.

Your general maxing order is going to be Final Chapter > Zoomies > Prowling Projectile > You and Me!, but you can play around with it a bit. The exact order isn't super important, but a few general rules to follow:

• Make sure you have Zoomies maxed by lvl 10 (this means you can put at most 4 points into Q before lvl 12). Unless you're building Luden's Tempest and trying to poke them down, Zoomies is going to be your strongest ability heading into the mid game.
  
• Put points into Zoomies/ Prowling Projectile in lane based on how the matchup is going. Generally, you want to prioritize Prowling Projectile until level 7, but if they have champs who can just negate that damage (e.g. Nautilus with Titan's Wrath, Nami with Ebb and Flow, Lulu with Help, Pix! etc.) then it makes more sense to just max Zoomies right away. Also, if you end up abandoning lane at lvl 6 to sit on your jungler, you will generally get more value out of a 3rd point in Zoomies since you won't have as many opportunities to land Prowling Projectiles.
  
• You can opt to max You and Me! second if you aren't able to get many Prowling Projectiles off in fights and you're sitting on someone who has a lot of raw stats (e.g. if you're sitting on a Blue Kayn who's only going to let you hit 1 Prowling Projectile before he one shots the carry and dips). However, you should still be putting at least 3 points into Prowling Projectile first since the buffs You and Me! provides are mostly percentage-based and don't do much in lane.
  
• E start is viable vs a lot of melee champions or short-range ranged champions like Brand where they have to walk into you. Otherwise, you won't be able to get value out of your E and would be better off starting Q.

Spellthief's Edge

Health Potion (x2)

Control Ward

You'll always want to start Spellthief's Edge, but whether you buy a Control Ward or 1-2 Health Potions will depend on the matchup. If you're in a matchup where you can trade your hp aggressively lvl 1 and 2 then you can opt for the Health Potions. If they have any hard cc, you aren't going to be able to consistently get value out of the double pots without killing yourself, so you're mostly going to be opting for the Control Ward or a single Health Potion instead. Note that if you manage to get two Spellthief's Edge procs before minions spawn, you can start with both a Control Ward and a Health Potion. Use your early Control Ward either in the bot river pixel bush or in a bush where it guards a jungle entrance (see diagram below). This will help you see dives coming ahead of time or spot the enemy jungler looking for an invade, which can often make a huge difference on the outcome of the game. Try to place it around 1:15, as if you place it too early you won't be able to stop the enemies from walking in and clearing it if they spot it.

Dark Seal Dark Seal is an incredibly gold-efficient item if you are able to maintain a high number of stacks. Yuumi is a very safe champion and most games you'll end up with very few deaths. Plus, because you don't have to use up an item slot for Boots, you'll be able to slot it easily. The earlier you buy it, the earlier you can start stacking it, so most games you should try to get it first back unless you're in a matchup where death is nigh unavoidable.

Faerie Charm Running out of mana is an issue you'll constantly be facing as Yuumi. Getting a Faerie Charm as soon as possible will help alleviate some of this pain and allow you to use your abilities a little bit more liberally. Make sure to get at least one of these on your first back (unless you're building a Lost Chapter mythic). If you have an extra 250 gold, getting two is not a bad idea.

Control Wards As with any support, you'll want to be picking up Control Wards so you can establish vision control. Use whatever leftover gold you have on these, and make sure you always leave a slot open for them as the game progresses. Buying lots of these does eat through your gold as the game goes on, so use your pinks wisely and try to avoid placing them in areas where your team can't defend them or they will die quickly.

Other than that, you should just be building components for whatever mythic item you're going that game. The priority will generally be mana/mana regen > ability power > ability haste > health, so you're looking for things like Bandleglass Mirror over Kindlegem, and Lost Chapter over Blasting Wand.

Moonstone Renewer Your go-to mythic option. Moonstone Renewer provides you with a ton of Heal and Shield Power (HSP), is very easy to proc with Prowling Projectile, You and Me!, and Zoomies, and provides a ton of value in teamfights with its Starlit Grace passive (especially if you have items like Chemtech Putrifier or Staff of Flowing Water). You can never go wrong with Moonstone, so if you're ever unsure about what's best, just go for the safe choice.

Everfrost Everfrost is an underrated mythic option for Yuumi that can be incredibly strong under the right circumstances. If your team lacks cc, it can be layered with slows to give you a root when your ult is on cooldown. It can also be a really solid disengage tool against melee champions like Xin Zhao or Kha'Zix who won't be able to dodge the Everfrost active after they jump in and can then be kited, where hitting 3 waves of your ult would usually be too slow. However, this item suffers from its increased price and the fact that it gives raw mana over mana regen, making your e cost significantly higher and therefore reducing the value of future mana regen purchases. It will noticeably reduce your healing output in fights so be aware of that tradeoff if you opt to build this over Moonstone Renewer.

Luden's Tempest Luden's Tempest is really fun to play with as your Prowling Projectile will start to really chunk your opponents. Most games this will be a suboptimal buy, but it does have its niche against team comps without a lot of poke where your team isn't in a position to take a straight-up 5v5. The extra damage from Luden's Tempest passive will allow your team to start fights with a big advantage, especially if you're able to hit their carries as a single Prowling Projectile will deal around a third of their hp. Note that with Luden's Tempest you should look to just max Prowling Projectile instead of trying to max Zoomies by level 10. Also, if you go for this mythic you should opt for more AP-oriented legendary items like Void Staff, Horizon Focus, or Staff of Flowing Water, rather than the pure HSP support ones like Mikael's Blessing or Redemption.

Chemtech Putrifier With the amount of healing in the game right now, you'll usually want to pick up a Putrifier second, especially if you went Moonstone Renewer. You won't be missing out on the HSP as much and will be able to proc the 60% GW more reliably via the Starlit Grace passive. However, if you opted for Everfrost, you're going to have a harder time getting the 60% reduction and you'll be missing out on a lot of HSP on your Zoomies, so make sure the healing reduction is truly necessary and that you can't just play around Ignite instead. Very rarely, you can build this before your mythic if the enemy team has an insane amount of healing.

Mikael's Blessing This item has an insanely powerful active which can completely negate champions like Lissandra or Twisted Fate. It's a very strong pickup if they have any sort of reliable cc that can be cleansed, like Frozen Tomb or Pick A Card. Note that this item gives 20% HSP, so it's especially good second if you decided not to go Moonstone Renewer.

Staff of Flowing Water This is a solid pickup on Yuumi if you already have Mikael's Blessing or Chemtech Putrifier or you're in a situation where neither item is particularly useful. Yuumi will always get value out of the bonus AP and AH that Staff of Flowing Water provides and so will most champions that you attach to, so this will almost always be better than Ardent Censer.

Ardent Censer Similar to Staff of Flowing Water, you build Ardent Censer when you don't need or already have Mikael's Blessing or Chemtech Putrifier. However, this item is less versatile than Staff of Flowing Water since Yuumi only gets minimal use out of the attack speed and on-hit damage, so if you're building this the champion you're sitting on has to be someone like Jinx or Jax who can get a lot of value out of the extra attack speed and on-hit damage. In 99% of cases you should not be buying this item before Staff of Flowing Water

Redemption Redemption is a solid HSP option but it's often overshadowed by the other HSP items that tend to be more useful. However, against team comps where you really need more healing in fights, where the enemy has tons of AoE damage, or when it's difficult to hop between allies in teamfights, Redemption can provide a safe way to give healing to your entire team.

Mejai's Soulstealer Yuumi's AP ratios are actually pretty low, so Mejai's Soulstealer is often a bit of a bait on Yuumi. Most of the time, you're better off getting one of the aforementioned HSP items instead, as you will a bigger heal increase from spending 1250g on HSP rather than spending it on Mejai's. Also, because you'll never buy Mejai's Soulstealer without first having a Dark Seal, you're really not getting value out of this purchase unless you're maintaining 22+ stacks. You should only build this if the game is going insanely well or if it seems unlikely that you'll be able to save up the extra 1050g to complete another HSP item before the game ends or there's a game-turning fight (soul, elder, etc.).

Vigilant Wardstone Vigilant Wardstone is a decent pickup if you don't have any more slots as it allows you to still have Control Wards late game. You should never get this before lvl 13 as it doesn't upgrade from Watchful Wardstone until then, and you should only be upgrading it either last item or if you don't expect to be able to save up the full 2300g to complete another HSP item before the game ends or there's a game-turning fight.

That's all for now. I'll likely update this guide later with different support matchups, but if you have any questions, feel free to ask in my Discord or just ask me on stream at twitch.tv/larmack.