Thanks alot for the awesome guide i really appreciate it and i have to say this is one of the best guides i have seen on lol pro yet so keep it up and again thanks!

Also i have a question about why you chose Blood Thirsters as core build and Ravenous Hydra as situational i would like to know your opinion on it because i like to always build it into my build as a replacement for Wrigglers Lantern but i would like to know why you chose this incase i don't see the improvements of Blood Thirsters.  Thanks for the guide and hope i hear back from you.

alright thanks allot for the reply. one more thing what is your opinion on AP yi?

Alright thank for the quick response and best of luck to you in the fields of justice.

Hey Refpsi, I'm a huge fan of your Master Yi guides, and I agree very much with the item builds and setups, but have a somewhat controversial question for you. I myself have played Master Yi pretty extensively over the course of the 3 seasons, both as an AP mid, and moreso as an AD jungler.

I was hoping you could answer a question or help provide insight into something that many high elo players look off as noobish: crit runes. Now I myself am a Gold 2 player and I understand the logistics of attack speed vs ad, arpen, and their value, however I've been running crit chance marks and quints on my jungle Yi as of late, and as you may surmise, my clears are slightly slower, though still faster or to par with other junglers, which is why I bring this up to begin with, even if gimp your early clearing, Yi STILL clears like a boss. ( *based on normal distribution of crits, it can go pretty quick if you get lucky, and honestly even if you get very unlucky he still keeps up with other junglers because of his Q and powerful AD steroid combined with his high base AS) I can run some timers on it to see exactly the difference in clear speed, but really I've never had a problem keeping up or falling behind with Yi. I figured since so much about AD Yi is focused on raw power and dps, why not crit chance, I mean in mid/late game nothing will really do more damage than Yi's astonishingly high, fast coming crits. In my opinion, crit quints and marks seem highly viable given Master Yi's kit, the fact that it barely impairs his jungle, and should mathematically give more dps than arpen, ad, or as. 

+1 Refspi! I appreciate the swift and informative response, I've run similar calculations and come up with similar results, and I've pretty much ruled crit damage out for the most part (for same reason as you), because their use and effectiveness is largely limited to the late game. Crit chance however has felt great every time I've run it on Yi, and most notibly makes him into a monster during mid game and in my experience helps speed his transition from mid to late game, the extra 20% you get from runes bumps Yi up to around 35% with his Wriggle's/Yuumu's core, which allows you to crit slightly more than once out of every 3 autos which is exponentially better than the roughly 1 in 7 you'd have without runes. (takes less than half as many attacks to score a crit!)

Combine that with Yi's ultimate and the Yuumu's active and you can tear most champs to pieces at this point in the game, its especially hilarious to gank Lux imo since she's so flavor of the month lately, dodge her bind with alpha, and just rip her apart in seconds, its pretty great, I'll generally max E tho if I'm going to be running this sort of setup, because when you all in someone such as Lux in this manner it's just that much better, and makes Yi such a powerful duelist midgame.

There's also something to be said for the lifesteal increases that go along with the maxed E and extra crits. As powerful as it is to max Q and land that 300 dmg resetting aoe death on their entire team, maxing E in this situation is what makes crit runes pay off (my opinion), so it's what I max first in most cases on this setup, also I dont remember if you noted it, but once you kill someone on Highlander, you get the passive AND the active Wuju Style AD bonus, which combined with that 35% crit chance and blazing attack speed.. it feels amazingly strong to me, assuming Yi goes in at the right time; he'll completely tear up!

Ok so I digressed alot, but Yi's the best, and you've written by far the most comprehensive guides I've seen, and just in general seem to understand his mechanic better than any player I've spoken with to date.

Master Yi jungle???  First tim i have seen this...

Hello now that the proc rate is a set 50% is there any situations where maxing E before Q is more beneficial? Or is the cd, burst and bonus damage from maxing Q just much better anyway?

Q>E :jungle clear speed, pushing  speed, and dmg is also much better. I dont even have to mention the cd.