Hello everyone, I'm Mivvv... This is my guide for Master Yi
This is my first guide, still I think I made a very general and a usefull guide.

So have fun while reading and comment please (without harassing)

Master Yi is an assasin, which can go for both AD and AP... Depending on
how you play and how you like you can build him up. May be
a very agressive assasin or a one man army with nuke and built in invincibility...
How you play is the key here.

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Why these runes? Simple. Since Yi is very squishy it needs every leverage it can use. Armor & Scaling MR runes are essential part of defensive runes. (Why scaling? since AP champions don't deal high damage early, it becomes handy at late game IMO)

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Now you may say dude wtf? I find these runes essential for AP Yi and don't be scared from the numerous runes they have very simple reasonings behind.

• Glyph's are for increase of AP for early game and a little boost for late game.
• Seal's are for defensive measures to remove squishyness get health & to take less damage from ADC or AD Jungle get armor.
• Mark's are for utility. I find these as utiliy, one gives you Magic Pen. The other gives you a little health boost.
• Quintessence's are the main reason you have rune pages. A very generous AP for start and a nice health to make you less squishy!

Flash is commonly used spell for quick getaways and chases so why not? You are very squishy, your only escape mechanism is your ulti. This will come very handy on battlefield. Ignite is a very usefull spell, reducing healing and dealing damage for 5 seconds... A nice way to finish your low healthed and running away enemy.

These are also an option; but I really don't use them a lot...

• Exhaust Usefull for enemy AD champs or helps you to slow down running away enemies. I prefer
• Cleanse Makes Master Yi very strong in combat and unstoppable, but can be covered with Quicksilver Sash
• Smite Only usefull if you are planning to jungle.
• Ghost seriously? Yi is one of the fastest champions and you want ghost? That means
  that Highlander is no use for you and you should stop playing Master Yi
  
  
  Spoiler: Click to view

  
  My friend and I had a little discussion about ghost, he said it is very useful for turret diving at early game. Well, I just don't like ghost, you are mobile enough why would you need it? Still I will put this in useful spells.
  

I don't see any reason to use these spells

• Heal can be covered with Meditate and it cannot be compared with Meditate.
• Revive can be covered with Guardian Angel (also why would you take it?)

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Pros + Built-in healing + Has gap closer + Also an escape mechanism + Not slowable when using ulti + Ulti resets all abilities + Very easy to play

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Cons - Low Health - Can be ganked easily - Q may pull you into bad situations - Very vulnerable to stuns - Very dependant on items (mainly dps)

Abilities


A boost for your auto attacks.
Might not look very fancy, still this passive saved many lives on 1v1 DPS duels. Speed is vital.

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This is your main farming ability, also when maxed your first damage dealer before getting into a battle. This ability is perfect for an assasin because

• You are untargetable/unhitable for about 1 second.
• Hitting multiple targets
• Teleporting to your target (gap closer, chase finisher)
• Can also be used to escape
• Low cooldown time (gets better as you level up)

Also you can harass enemy champion on your lane if he is close to minions, just aim at a minion and hope that alpha strike will hit him. Plus hitting multiple targets is your best friend to farm Yi.
(more detailed information about Alpha Strike is on "Details: How to use Alpha Strike!" Chapter))

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It is not a skill you would like to have; since it depends on AP. Still there are a few uses like healing plus; getting armor & magic resistance which is usefull against Requiem or dealing with effect of Toxic Shot

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Your first AD improvement! Passively increases your damage and when active you deal two times more of that increase for 10 seconds. I find this quite usefull at early game to get the first blood. For mid and end game you will instinctively use this skill when attacking an enemy champion or turret because of its 70 AD boost.

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You depend on this skill! It is as necesarry as breathing for Master Yi. Because it gives movement speed and attack speed; since you are building AD that DPS will be quite usefull.
Also very usefull at escaping ganks, chasing enemies, fastest tower destruction just name it. It has a very low cooldown and when combined with Wuju Style it is purely lethal! When you kill an enemy champion all your cooldowns are reseted to 0, so if you are sure about getting a kill use all your abilities!

I don't think this needs some explaining but, Wuju Style is yourtop priority as an AD, level it and get your AD bonus. Second priority is Alpha Strike, which is essential for farming. Meditate is at the bottom of the list. Why? because it highly depends on AP, which we don't have. Still, if you need lane sustain, take it at level 3.

1. 2. 3. 4.

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Attack Order for Yi is very simple. It is like playing chess. Make your opening with Alpha Strike, just before you land use Wuju Style. Become king of the square by activating Highlander. Your enemy will go defensive, but it would be unpolite to let an enemy escape. If you think you can get a kill, use Alpha once more and repeat.

Why this is used?
Comparing with other items & 6th Items

Make a coffe and watch this to clear your head if you are thinking of reading all of the guide


Play Video

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Pros + High damage harassment + An interesting nuke + Safest farming skill + Not slowable when using ulti + Ulti resets all abilities + Built in health pack + shield

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Cons - Low Health - Needs to farm a lot - Q may pull you into bad situations - Very vulnerable to hard CC - Very kill dependant gameplay - Very item dependant

Abilities


A boost for your auto attacks.
For AP, it goes well with Spellsword . Even that little damage counts.

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Learn this skill well; because this is your:

• Main Damage Output
• Nuke
• Farming Skill
• Harassing Skill

Why so important?
As an AP Carry, you only rely on your abilities and the downside of Yi is that you only have one skill to deal some damage! But it covers with a damage "300 + %100 of Ability Power". Using this unassisted is something you will do at early game, but in mid/late game... Combine all the AP item set and Highlander. Once you get a kill, spam your Q on weakest. Chain kills = PENTAKILL

(more detailed information about Alpha Strike is on "Details: How to use Alpha Strike!" Chapter))

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This will keep you laning like Garen. After the patch 3.01 AP ratio on Meditate has been decreased to 2.0 from 4.0, which Yi more vulnerable. This will prevent you diving in 1v5 battles, but it shouldn't be a problem in rest of the game. My advice from now on don't rely on your meditate you are no longer invincible after this patch. Except being interrupted by some hard CC, this skill will give you a good protection for 5 seconds. Like Zhonya's Hourglass with a doubled time. With that 5 second bonus, it will refresh your Alpha Strike and you will get more kills. Also you can pull some enemy champions to a trap!

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Definately, not for AP Yi. Still this little improvement will help you to take towers and deal small amounts of AD (like about 180 when activated).

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You live for Alpha Strike; but you breathe with Highlander. Why? Simple. Refreshes all cooldowns on a kill! Your main damage output is Alpha Strike, so use your items and Alpha in a teamfight. You got a kill? Good, repeat the process. Since your Alpha Strike deals massive damage, and cooldown never occurs since you got a kill. You deserve to get a pentakill.

This doesn't need some explaining but, Alpha Strike is yourmain skill and your only damage dealer as an AP, so level it up as much as you can. Second to level is Meditate, which is the greatest sustain skill ever, also your defensive & baiting skill. Wuju Style must be least of your concern, since we are building AP.

1. 2. 3. 4. 4.

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Attack Order is very simple, but hard at using. Since you are AP, you lack of auto attack damage. If first Alpha Strike doesn't deal 3/4 of your targets health, that kill becomes very risky. Assuming that things go well, use Alpha, then combine Highlander + Wuju Style and let Yi do his work. (you might notice that there are two of "4." this is because if things go very very wrong use meditate at a safe place. If you can't go to a safe place or your enemy has no hard CC, just use it as you see your health drop less than 3/4)

Why these items?
Comparing with other items

A Youtube Comment About Master Yi

Play Video

If you've watched this will give you an idea about how to use Alpha Strike in team fight.

• Aim for the carry or the guy with the lowest health. Start with an item active as an initiator.
• Use Highlander and attack with Alpha Strike. Make an auto-attack. Still not dead? Use Wuju Style and make another hit. (Assuming that you've built the full item build.)
• He should be dead, now proceed to next low healthed champion. Remember to use Highlander to continue this combo.
• If you are in danger, such as you got one kill; but 4 of them are focused on you and you couldn't kill another one. Use Meditate if it is very critical, use Zhonya's Hourglass.
• Later use Alpha Strike and Highlander combo again.

Tips & Tricks About Alpha Strike

Since you are an assasin, you rely on teams & lanes. If your team is good, you will be the damage source. If they are good, you will deal the damage, tank the incoming damage (for AP) and make critical skill combos to save the game.

Depending on lane is about the champion getting fed and as we know a fed champion is a good champion ;)


I hope I helped everyone who is willing to become a Master in Master Yi...
If there is anything I've forgot or you think I should add please make a comment =).

Good Luck & Have Fun
Sincerely;
Mivvv

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19/11/2012 = Made the guide
11/01/2013 = Re-made the guide for S3
13/02/2013 = Added Runes, changed masteries, added ghost to useful spells and added another description, changed some descriptions about items. (Will update AP Yi ASAP no worries)
14/02/2013 = Happy Valentines Day! Updated AP Yi (Items/Runes/Ability/Other Items) added some info about the nerf his meditate got. Also corrected an information about Alpha Strike. (Will be working for eye-candy of the build)
15/02/2013 = Destroyed some walls of text, increased eye-candy. Now it is more readable (for me)
18/06/2013 = Planning to make a massive update, adding AP & AD Yi Jungle and more about why AD yi is not a common pick
30/03/2013 = Added Statikk Shiv to optional items.