The title basically sums up my question, what do we do about tanks anymore? It doesn't feel like Armor and Magic pen do much anymore against any of them, is it just me? Sorry if I am just seeming like a whiner but I really wanted to ask, I know the usual "BORK, Lord Dominik's, Void Staff, Liyan, etc. I mainly pick my champions out of who I enjoy playing, but should I switch off to Kog, Vayne, Malz (tank shred) etc?
myapologiesforbeingawhiner.
The usual still works very well.
If they proc colossus wait for it to wear off then engage while it is down.
QSS, armor pen
Mages are weak against tanky. Really weak.
I build 
against tanks, but deal almost no damage it seems, even though they only have 
Hope you have a draven in your team. draven is really good against tanks. Draven can build 
and shred tanks fairly easy. Just peel for him
Mages got the short end of the stick on this one.
Mages don't have a fancy lethality equivalent item.
The best %Hp item we have is @ 2% per second. So, not counting other damage sources, and life regen/steal of the enemy.
It would take 50 seconds to 100-0 a tank with that damage.
Compare that to 
which does 4% per hit, and the max attack speed is 2.5/second.
Which means a 
could 100-0 the same tank in just 10 seconds. And, that is not counting the damage from every one of their auto attacks.
Building Magic pen items is not the most efficient way of maximizing AP. So, you will lack the damage to kill those squishes that build no MR.
Riot has made it to where a mage cannot come back from a game where a 
and 
, go late game.
This doesn't even mention the amount of damage a tank is allowed to dish out these days.
If the enemy tanks aren't braindead, you are not going to get anywhere near their carries.
Maybe one day you could play any AP champ, and itemize a way to kill tanks.
Tear my reply apart, prove me wrong, fight your point. If you learn a way to overcome this META PLEASE TELL ME.
Armor pen does pretty well, so does lethality since it is buffed pen and you can stack it to the heavens.
We have items as you mentioned to take care of them. I think these items do the job well however I do think there is still an inherent problem with tanks dealing too much damage. I get that it is hard to get people to play a champ that is meant to soak up damage but that is the role of a tank in most games yet in league it seems tank means some bruiser who deals massive damage and is hard to kill.
I think less damage on the tanks means we can give them more tank stats, and lessen the impact of tank items which means we can limit the assassins that like to build tank who aren't meant to and could add some major utility to the tanks such as annoying auras so that they can still pull agro despite not doing much damage.
