Can't build HP because of his W + 
+
. Can't build Magic Resist because 
. Can't build armor because all of his attacks are based on my HP anyways, so I'm just clueless what I'm supposed to do without picking a champion with a point and click stun lmao.
Oh, let's not forget 
who makes him impossible to kill, literally.
Umm...
More magic resist is the best way to counter Wit's, actually.
+ 
makes him pretty sad.
Fully agree. God is super busted right now. His % hp dmg is 2 high. And lulu or janna on his side is the most broken thing since ap master yi.
But for now. If you are on a tank. Build randuins omen and adaptive helm. It will cut his as. His crit dmg. And his magic dmg. Then you neeeeed ninja tabi to cut his aa dmg by snother 10%.
Then you can get thorn to make him "hurt himself" and cut his healing.
Then you get 2 more items.
That being said. Still broken you pretty much need to end the game before he gets to 3 items.
does a pretty damn good job against him.
Wits end is flat mr shred, not % so getting high amounts of armor and magic resist will mitigate his damage. Adaptive helm in particular reduces damage from his w, so its one of the best mr items to get vs kog.
This thread should be named, how do I itemise against Vayne?
Im not sure about what im about to say, i dont play much league lately so i havent faced kog to try it out. He builds more or less hybrid. The counterbuild of hybrids is to buy resistances since they lack hybrid penetration. Stacking resistances is the best way to deal with hybrid. I think thats the reason jax doesnt build anymore hybrid. He wont be able to void staff since a portion of his dmg is ad. He cant buy last whisper since the other portion is magic dmg and last whisper scales much better with crit. He cant buy both of them for obvious reasons.
Impossible to kill? Oh you mean how any marksmen can build one of these . . .
i''d also love a way to counterbuild vayne but whatever floats your boat.
= kogmaw's late game power spike. If he ever gets this, he's gotten too far ahead and won the game.
Stack armor and MR.
He does both Physical and Magical damage.
is reduced by armor.
Ban every game to avoid facing that cancerous bot lane combo.
I couldn't agree more. Kog should be scaling in the late game, not mid-game. That or he needs to have his scaling redefined.
u p v o t e d RIGOROUSLY
Even if it's hp % damage, it's still magic damage or physical damage, so it will always get lowered by armor or magic resist. One tip I should give you, is don't build the item that you need. Build the item that you will need.
Kog'Maw's %HP damage is magic.
Magic resist reduces it. Adaptive Helm reduces it.
Try 
+ 
+ 
, it counters everything.
How to build against a Kog:
Ask your team to ban 
and Shen/Sona/Nami/Galio
they're all items for him anyway
Kog'maw is one of those champions (along with maybe Kayle) that thrives in long-duration teamfights. He's not that bursty - at least, no more so than your average champion building AD items - but when he has a chance to ramp Guinsoo's all the way up, he does an absolutely horrifying amount of damage.
There are two things you can try to do:
If you're tanky, build attack speed slows. Kog'maw's ultimate is essentially only good at finishing off fleeing people, and his slime spit is really just there to keep you in place. The vast majority of his damage is AA based. The goal here is to make him take longer to hit 6 stacks on Guinsoo's.
If you're squishy, don't engage him while he has Guinsoo's fully stacked. A 6-stack Kog'maw or Kayle is going to do 50-70% more damage, possibly more. Kog'maw with no stacks won't be able to kill a fed Yi before he can hit Q. A 6-stack Kog'maw can kill Yi before he gets into alpha strike range.
Best way to beat Kog is to have effective zone control and engage/disengage tools.
I think Rakan is a pretty good example:
Dash in, hit Kog - he presses w, hos team uses some peel. Dash back out, wait for w/shields to fall off, then engage, hard
Kog is basically worthless without W up, and if you can bait out some meaningful peel while you're at it his team has nothing left.
I don't know why the boards are freaking out so much about that one game, diving head first into kog was never the answer to a protect-the-kog comp - the answers are poke, when it's strong, rotations when it isn't (the team's effective rotation speed is limited by kog'waddle, as the rest of such a comp has poor damage), and just kinda playing and moving around Kog and his W.
Set the terms of the fight, and set them as something other than "Run face-first into Kog with his W up and his full team peeling him. That can work if you have a big gold advantage and a solid dive comp 
but it's always risky as hell to just run at Kog and try to outdamage him - it basically the teamfights equivalent of a base race.
Attack Speed Slows help a lot.
one shot him before he three shots you :)
oh wait
aoe one shot them before they can react :)))
