Assasins VS Pentakillers

So, I personally enjoy all variety of champions. Be them Champions that jump on your face and kill you then waltz out like it was nothing like and I also love champions that can fight the entire team if they aren't focused or locked down. That when the other 4 team mates are dead the Janitor squad dunks their way to victory with the most painful unkillable wrath of justice Champions like and After them come other fun champions that exist solely to lock you down and be a meatsheild or (in mega form). Then there are you Duelists like and However there has sprung up a problem lately in league that is seriously starting to frustrate me. A lot. and that is Champions that are both assassins and Pentakillers. I have no hate for either one, it is only when they are together as one champ that it feels game breaking. Assassins should be single target and blow up squishies but there is a terrifying group of champions that can't be locked down and can't be defeated by grouping. They are they instant death that solos the whole team and they are completely pick or ban. I have yet to win against any of them. They are champs like and Unstable whirling servishes that erase people. They aren't even like Carries that are susceptible to ganks and lockdown. and are all champions that will lategame crit your face off and there is no chance. But they gotfed, they got ahead and they took advantage of it. The team worked together to feed them and now it pays off but even then the carry can be outplayed with the use of some CC and tank stats. There are a group of champions that have no outplay on a team level and as a result can not be stopped. They are literally a time bomb that can't be defused and your team simply has to win the game before that point is hit.

TL;DR: There are some champs that kill one thing fast, and some that kill everyone when they get the right situation. But there are now the Assassin Pentakillers that are as absurd as old Fiora. They need to NOT be able to instant blast the whole team.