Yes, youre correct.
But in a thread about "how to deal with" and then a specific champ... what youre supposed to do against anyone is in poor taste imo.
Some ways to actually deal with Karth would probably include playing champs with lots of mobility. Champs with CC immunity or cleanse effects like Eve or GP. If you get caught by his wall of pain, then you will infact be in pain cause thats at least 2 Qs you will probably eat.
So any champ going up against him mid lane would have a much better laning phase if they bought
. Even if youre AP you can sell them later. They will significantly aid in avoiding his Qs, help take fewer Qs when you get hit with wall of pain, and help offset the magipen from the wall. Another option is
for avoiding Qs and recovering from wall of pain.
Champs like Yasuo, Zed, and Kat have the mobility to avoid repeated Qs and Zed and Kat can bypass the wall potentially if they get caught on the wrong side or want to continue an assault. AD champs can of course build
for timed ult avoidance. Anyone can build a
and have a decent chance of ignoring a few ults.
The most important thing is to never focus down a Karth first at an objective like Baron or Dragon because he will still be there as a ghost from his passive using attacks in the area. If you kill him in a general teamfight, leave the area. He will still be there and be vengeful.
Probably the best tip I can give is to really keep track of the jungler on Karths team. I know I slam my ult when the jungler is ganking bot every time I can. If I KNOW it will kill my enemy mid laner I will possibly do it, but sometimes I resist the urge and wait on that botlane gank. It gives me a good shot at either 2 assist, a kill and an assist, or a double kill.
Also if youre keeping wards up, it should be easier to avoid Karth ganks because if he comes to your lane with wall of pain then life is about to suck.
As was mentioned Soraka can really help take the sting out of a Karth ult, and avoid him getting a post teamfight/gank triple kill from anywhere on the map. Champs like Kayle and Lee Sin on your team also can aid in spot saving people from death.
If Karth gets ahead then avoiding him and trying to take objectives he isnt near till you can catch up is helpful. If hes really ahead then MR and playing smart are the only choices because if he ever gets to a point where he can ult and the lowest damage he does to anyone is 500 then other people may be taking 650 or even 800. At 500 AP and lvl 3 ult his base damage on ult is 850. With enough magipen he can ult and cut the HP on some of the enemy team by 1/2 to 1/3. It may also hit the enemy team with
.
If people play smart, dont feed Karth then he can be burned down quickly. Leaving the immediate area and resetting the engage will still have him doing some damage to your team, but hopefuly avoid any deaths.
Lastly
can help deal with him if isnt very strong but definitely a threat. Its another way to negate his ult as a killing tool. Its also a way to avoid giving him gold if he manages to take you down with his death passive.