A great guide! I feel like people reprimand AP AD hybrid Kog'maws because of their lack of proper damage output. Attack speed is what is usually lacking from said hybrid builds, but you have meshed in a great patch for that large hole, letting you do some great damage at the end!

One of the problems I have is your mana glyphs and flat mana regen seals. You will have some great mana regen early game but then after that, it kinda goes to the pooper. You constantly have to wait for enough mana to launch your R I have found when trying your build a few weeks ago. Also, without my usual CDR glyphs, it feels like I'm giving too much time for the enemy to guess where my next living artillery is going to land. I usually like ulting on them twice in a short amount of time.

Great overall start! I'm eagerly awaiting updates!

gj

finally some one thts gets just how strong and vaible hybrid kog is while i have ppl tell me it is shyt but i think its best way to play gj dude.

What about Wit's End?
Malady and Wit's End are like made for eachother!

Well this is good, but it has it's downsides. first of all the glyphs. you have flat mana regen and that should really do. besides 90 mana is one void ooze.

And the dorans blade, rather grab ring. if you go mid atleast. you can harass better.

and about maxing bio-arcan barrage first. yes it is your best skill but it is weak early game. at lvl 9 people has 1k hp ca. meaning wow 60 dmg pr strike. good but not epic. if you have it at rank 3 at lvl 9 you still deal 40 extra.
and maxing void ooze if going mid is best for out laning(and farming of you got the mana)

And i am also suprised about the items. they have very little aspeed, it looks like this build as most other focuses on bio-arcane barrage. and then hextech is kinda useless.
Switch hextech with rabadons or nashors(i saw you had it in the optional items)
rabadons will increase bio-arcan by alooot.

And the flash description is a little wrong. kog is not very gankable. easy to scout bushes with ulti and has a slow. so i say meh. not unless amumu and ww ganks you at same time from both sides.
and really? berserker greaves?
Those are the badest boots in game atm. what about sorcere's shoes? those will increase your dmg more than berserker. and better harassing early game.

And im suprised you did not include rylai's or frozen mallet. since you are auto attacker frozen helps and you spam skills(rylais) and you have no cd(why nashors should be in the primary build)

Dont take me wrong it is a very good build. but these are the things i think are dumb :)
and no i wont downvote but i wont upvote either.
Try these things and tell me what you think.

Proc Kog is the best Kog...<3

Very good build and updated, i would just tweak runes a little, but overall good :)

pretty solid, like it, good work

nice build bro

One More thing, get different glyphs (I prefer CDR over mana on my carries) and seals of Clarity are better imo.

Looks good so far! This build looks like it would deal some insane damage, although I usually prefer mercury's treads on most champs due to the current metagame. Although if you're careful and have your W up with banshee's... shouldn't be a problem. All in all, looks like a great build!