Hi all:D It's my first build, i think It's really good and everyone will vote it after battleground test :D

(i know my english is bad^^)

Pros:
-Big damage
-Awesome range
-"% of health" damage
-Passive

Cons:
-Very squishy
-Very team depend

Magic Penetration Marks- We are a hybrid so we need to boost our ult dmg, void ooze and bio-arcane barrage.

Mana regen seals- mana regen is always welcome for our ult

Ability power glyphs - next boost to our abilities

Magic penetration quintessenses - more penetration

I always start with doran blade but you can choose doran ring too.

MALADY - Nice atk speed, ability power and unique passive for low price. Worth it!

Berserker boots - your choice too - or berserkers or sorcerers.:D Boost to atk speed or magic penetrate.

Hextech gunblade - REALLY good item, Ability power, Attack damage + lifesteal, spell vamp- Next must have.

Nashor's tooth- Atk speed and ability power , next good choice.

Madred's Bloodrazor's - just 4% dmg boost. with your bio-arcane barriage its 10%hp per shot!

Next 3 items are defensively, its your choice what to take.

Flash- probably 95% used for escape, coz kog don't have escape mechanism =(

Exhaust- anti dps :D

I always max as first skill bio-arcane barrage but you can choose void ooze. It's open hybrid build, everything got adventages and disadventages. It's your choice how you will control it :D

I hope that build will help you to pwn ppl easy , but remember - YOU CAN'T DO ANYTHING WITHOUT COVERING YOU TEAM :D

Good luck - NiohNioh