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This build is officially for Yi jungle, whose really like wandering around farming, last hit, and being an impossible-to harass target.

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With this play style, Yi should be active 110% on ganking and moving the whole map. During the beginning of the game, Yi might get some trouble if he was being focus, but after he have some attack damage, attack speed, changing into an AP player is a good choice for being a damage dealer.

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Avoid 1 vs 2 above if you do not have enough confident on yourself. Yi need a lot of team fight because he only have <2000 hp, and 840 mp.

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Notice

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--I DO NOT SUGGEST STARTING THIS BUILD WITH ABILITY POWER! ALWAYS START WITH YOUR ATTACK DAMAGE BUILD
--With this type of Yi, you are the most vulnerable member on the team. Think smart, play well, and support your teammate with the your best attitude! Good luck!

---- Yi is a hard champion to handle. Yes when he was fed, no when he feed, but teamwork took 70% chance of winning the match. Pay attention to your teammate - what are they doing, what did they buy, and make your right decision on what should you take to carry your team
---- Yi is perfect for hardcore play style. He have variable build to go with, also my build.
My build makes Yi weaker in attack damage, but way stronger as an AP damage dealer. So it should be balanced.
---- This Yi build should be more active if your team have a lot of stun skills (Amumu, Leona, Sejuani, Alistar ...etc); slow (Karthus, Singed, Akali,...etc); harass, charm (Fiddle Stick, Lux ....etc)
---- This build already tested in both Ranked and Normal game, so i released it to community.
My summoner name is TrânCanhThanh, you can leave messages to me if you think this build is not good. Thanks for the vote btw (if you do vote)

About the rune, i only focus on being hard hitter, so it doesn't matter if you mix it with another type of runes.
The more variety of runes you have, it will bring your champion to a new level when you can ace it. So think before you choose this build.

Again, there is nothing more i can say about this because i just focus only on last hit, so my mastery just focus on damage. You can bring up with some cool down/mp regeneration masteries.

---At the beginning, i mainly go with the boot and hp,mp potion. At that moment, you should decide where you should stay as long as possible in order to lv up and support your teammate. Hope you will get your first blood before you reach lv 3.
---After lv 3, you i suggest you should start jungle. Start with small monsters like golems, wraiths, wolfs to get yourself catch up with your teammate instead of trying to getting blue or red then returning to base with low hp.
---If your teammate give you a leash at blue or red, you should take it, don't make them wait for it.
---You should get Berserker's Greaves as you finish 1 circle of jungle, or 1 kill/support
---Your next goal after Berserker's Greaves is Phantom Dancer. Try your best as a normal yi to get Zeal to bring your attack and movement speed up.
---You will be hidden in jungle for a long time, so you should buy some ward, or an oracle if you have good condition. Your ganking is totally perfect with those items.
---After reached Phantom Dancer, you should add some more attack damage by buying Infinity Edge as your main dammage.

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This time has come

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AP TIME----
---If you are good with Yi, you should get a lot of kills or supports. If you are not? It's ok
jungling more, killing dragon and save your money. 1600 is the number you really want to save to buy Needlessly Large Rod.
---At this point, your damage on Alpha Strike equal [x(+ 100% your ability power)], your Meditate = [x(+400% your ability power)]
--- You should moving non stop from lanes to lanes for farming now. No one can stop you unless they gank you from jungle, so don't drop your guard down
--- Keep following the build until you got 6 main item of this build :
- Berserker's Greaves
- Phantom Dancer
- Infinity Edge
- Rabandon's Deathcap
- Void Staff <~~~~~~~~~~ more damage on AP
- Last Whisper <~~~~~~~~ more damage on AD

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Note

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+ Instead of going with 2 main AP item, you can add some more AD items to go back to your AD style if AP didn't work so well. Your AP from runes, masteries and kills will help you.
+ If you think you need some more HP, you can buy Warmog's Armor or other health armors
+ You can buy Hextech Gunblade for more surprise to opponent team

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Important

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ONLY MAKE CHANGES WHEN YOU ARE MAKE SURE YOU CAN DO THE DAMAGE! DON'T CHANGE IT HALFWAY.
SOME IDEA WON'T WORK RIGHT AWAY, SO KEEP IT UP, DON'T CHANGE YOUR MIND RIGHT AWAY. LET YOUR INSPIRATION GO!

-I use Exhaust combine with Ghost for a perfect ganking from jungle with speed and slow your enemy down. It also a perfect mind-trick to your opponent at the beginning of the game, so let them surprise where you are!
- You can combine Exhaust with Cleanse in order to survive if you got gank in the middle of jungle. Remember to wait for your chance to escape, don't rush right away. I really hate stuns, but my teammates make me fell safe when they call mias from lanes.
- Classic choice : Flash and Ignite. I have no idea about this, but it also work with me perfectly.
- Jungle Classic : Slow and Smite. Work good, but they will know that you are jungling, and you will have a lots of uninvited guests come from other half side of the map.

In this build, i suggest you should stay in jungle like 60% of the game, in order to
- Get buffs, put some ward for teammates
- Ganking support, surprise attack
- Take care of all lanes (Top-Mid-Bot)
- Push lanes with others on the same lane

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You can make them surprise by leaving lane at the beginning of the game and i suggest again, it should be on top. Because of you are a real jungler, and you don't want them messing with you by ganking you in your jungle, you only need to stay at top for at least lv 3, then you should leave the soloist alone to lv up.
-After getting your first dragon, you can rejoin your teammate at any lanes if they need help.
-Be aggressive on your game, not with your attitude. Bad attitude ruined 88% of the total LoL games.
-Don't rage quit !

Pros :
- Aggressive champion
- Great damage dealer (even better than Nidalee's spears)
- Good jungler
- Adaptable to any situation (can shift from half to half into 1 specific build)
- Mobility
Cons :
- Low hp and mp, easy to die if got stuns
- Need teamwork
- Shopping cost (wards, re-shopping if things change...etc)
- Can't carry team if your team is feeding the other team