Hey guys, and welcome to my very first guide !
It's gonna be about Master Yi, which I play a different way than others.
I play him a special way, which I hope you will love to both use and read about!

My runes are quite weird for this build, but it gives what I need.

My Marks are:
Greater Mark of Desolation

My Seals are:
Greater Seal of Armor

My Glyphs are:
Greater Glyph of Magic Resist

And my Quintessences are:
Greater Quintessence of Desolation

Reason I choose these over others are quite simple. This build allows you NO defense.
I choose Magic Resist because of those nasty people like Morgana and Lux, which can tear you apart in seconds
I choose Armor because of those other nasty people like Xin Zhao
Armor penetration dosen't really require an explanation I guess, it's pretty normal.

My masteries are the standard 21/0/9.

I really like having 9 in Utility instead of having 9 in Defense, mainly because your runes will provide you the extra defense, and in Utility you can get some Mana Regen and a bunch of nice extra EXP!

The items are weird and most of you will not understand them. But I like them, and I love to use them!

I start out with Long Sword and a Health Potion
I upgrade Long Sword into The Brutalizer and buy Boots aswell
Then upgrade Boots into either Ninja Tabi for the extra survivebility, or Berserker's Greaves if you feel like having a lot of Attack Speed.
Finish your The Brutalizer into a Youmuu's Ghostblade
Now, You can choose between two things.
You can either grap 2 Vampiric Scepter's and upgrade them, but I don't recommend it.
I usually buy an Emblem of Valour and a Vampiric Scepter
Then upgrade Vampiric Scepter into Wriggle's Lantern and Emblem of Valour into Stark's Favor
Now buy 2 Vampiric Scepter's and build the first one into Executioner's Calling and the second one into Bloodthirster

Now that you are full build, don't forget to buy Elixir of Agility, Elixir of Brilliance and Elixir of Fortitude. It's a common mistake that people do not spend their money on this when they're full build, but it is so awesome to have.

Now, there's a lot of Master Yi's out there who dosen't know about this, but use your Alpha Strike to either hit enemies to harras them, or farm with it! If you are lucky, it has a chance of dealing a lot of damage to minions!

Another tip I will give is PLAY DEFENSIVE IN THE START
I can't stress about how useless Master Yi is in the start, it's incredible.
And don't play hero. You cannot solo every1 unless you are really fed, or they don't have any CC.

And now my last tip. WATCH OUT FOR SNARES AND STUNS
If Taric or Twisted Fate stuns you, thats it. You are dead.
Thats why you need your tank to initiate, because they will go berserk on him, and you can pick up easy kills on the squishy targets in the back with your amazing lifesteal!

And my last LAST tip, lol. YOU WILL WIN EVERY 1v1 THERE IS
Your lifesteal will save you, no mather what you do.
Trying to run with half health? beat some minions up on the way.
Trying to kill someone, but you don't know if you can do it?
Lets say it this way. When you are full build, and you are facing an enemy with no stuns, go for it. but only if you KNOW he is alone. Or else you will just be dead meat on a silver plate, and who wants their best teammate to be dead meat? No1.

I probably will get a lot of negative votes if I didn't show this, but it is easy.
Your lifesteal will hang around 70-80%, and with your 250 AD, you gain a stunning 187 HP per hit! That is a lot of HP. And you have your passive, which also stacks with lifesteal.
Get both buffs, get all elixirs, and then, pop Youmuu's Ghostblade and hit it to death.
And then just to be an a******, write in chat "I heard I could solo Baron Nashor"
I do this every time, and I once had a group to surrender after I wrote it and came out with the buff.

Well guys, that's it!
I hope you really liked my guide, and if you did, remember to write a comment and vote on the guide!
And if you find anything "wrong" or if i "miss something", write it in the comments! I would really appreciate your support, since this is my very first guide. And if you like the guide, I might do more on different characters..