How the fuck is normal that 1 mushroom to take 60% HP of an ADC

You built no MR and the Teemo had a lot of magic pen. Can't say you have much to argue about here.

How is it normal that a right-click takes up to 40% of someone's hp ?

Teemos shroom mechanics IMO are 100% unhealthy for the game. Hes too much declared as ''satan'' so anytime hes frustrating people overlook that frustration and simply say its because hes the devil.

Bitch champ needs a rework.

well aren't they suppose to be squishy? people are complaining that they are too tanky due to supports. i'm guessing you either roamed without a support as an adc, or yet you stepped on a mushroom that your supp was clearing, and they didn't bother to shield you because you walked into it as clear as day

It all depends on how fed Teemo is, how much you fed, and how long you were disconnected for.

Let's do some math for the game you are complaining about.

Teemo:

40% pen 18 pen 2% burn for 7 seconds 2% more damage per second 230 AP

Kai'Sa:

1712 HP 37 MR

Shroom damage:

112.5 + 12.5% AP per second for 4 seconds = 141.25 2% of 1712 = 34.24 Total damage per second = 175.49

Magic resist after penetration:

37 x .6 - 18 = 4.2 = 4% damage reduction

Damage per tick (before res):

1. 175.49
2. 179
3. 182.51
4. 186.02
5. 36.98
6. 37.66
7. 37.66

Total = 835.32 After resist = 801.91 damage

His shrooms were doing 47% of your hp in damage at the end of your last game.

Let's see what would have happened if you built which has 35 MR.

MR increased to 72 which is 42% damage reduction. After penetration it becomes 25.2 which is 20% damage reduction.

Total damage would become 667.19 which is 39% of your hp.

Because last pre-season it was normal for 1 shroom to win a game with just liandry's torment. They were nerfed hard and all his damage got shoved into his Q. His E recently got nerfed as well. You had to be playing a super squishy champ with no mr or hp items to be losing 60% of your hp these days to teemo

But you do realize that an adc can do the same with a single basic attack right ? makes that basic attack safe to make too