Keeper of the ancient art of Wuju, Master Yi is a mystical warrior from the isle of Ionia. He descended from one of the few tribes dedicated to the preservation of Wuju, a martial art founded with the principles of absolute spiritual awareness of one's self and one's enemy. When the armies of Noxus invaded Ionia, Master Yi joined in the Ionian defense to fight the craven enemy, bringing his village honor through his unparalleled mastery of the blade. The ensuing battles ravaged the land, but no conflict inflicted as much horror as the day the armies of Noxus closed in on Yi's village. Left undefended, the village became the unfortunate test subject of the latest invention by an up-and-coming chemist, now known as Singed. The remains of the village that Master Yi returned to were so horrific that it remains a festering scar on Ionian history. To this day, no Ionian will ever publicly speak of what occurred.

After the Noxian invasion was contained, Master Yi fell into a deep isolation. For years, he trained morning to night, speaking to no one and refusing offers of consolation by fellow Ionians. The only thing stopping him from madly charging into Noxus battle lines headfirst was his pledge to keep the Wuju style alive. Even though he seethed with impatience, his rage became a tool for sharpening his practice of Wuju, developing stronger and deadlier skills for his eventual vengeance. The only thing that roused him was news of the League's formation, and Noxus' subsequent enrollment in the League. Master Yi now brings his mastery of the blade to the League of Legends with unflinching purpose: to avenge his kinfolk and end the predations of the Noxus once and for all.

''The art of Wuju lives on in Master Yi, and is plunged through the hearts of his foes.''
-- Soraka, the Starchild

Master Yi lore.

We use master yi AP jungler because his attacks are scalable in AP. The Alpha Strike damages with AP and the combo is Alpha Strike + Wuju Style, after the ultimate (optional).

Now, we look because jungle with yi.

- Yi its very fast, more monsters and fast ganks.

- Yi its very strong with wuju style, use this with, for kill more monsters.

- Yi can gank two lanes consecutives, thanks to the meditate and the ulti.

- You must ward all the map (in case of not got a support).

We use Greater Mark of Potency because the ability power total its 6 + masteries= 10. This is basic but the build increase your ability power.
Use Greater Seal of Strength (I did not find the runes in the list, use the TIER 3) for increase your AD.
The Greater Glyph of Insight because we build MASTER YI AP.
And finally the Greater Quintessence of Furor: the traditional yi has critical chance, we use something of the traditional and combine with the yi AP jungler.