Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Okay, first build posting here. Now, Kog is the character I play the most, starting from like, level 5. I can (arguably) play him well, and this is what I came up with that does alot of damage very quickly. Ive tried many other builds and they all seem too extreme in their purposes. I"ve also tried AP builds, but they just don't seem to flow right every time I play them. In my opinion, with Kog you get the most effectiveness with a high attack speed with percent health damage along with some crit and armour pen. The movement speed never hurts either. If you have any comments or suggestions, feel free to tell me, I'm always working to improve my build!