True Damage
If you can deal 50% of somebodies HP as true damage, it needs to be nerfed/removed.
Examples: Fiora Vayne (least op since it takes 3 hits) Irelia Yi (sated)
Whenever I look at my deaths from facing them it's like 1200-1600 true damage from Fiora, Yi, Irelia. Doesn't matter that I'm full tank rammus with 3000 hp, I instantly melt because there is no counterplay to it.
True damage is just stupid, unless it is a 3-hit proc, or has a kit that isn't broken (Like Vel'Koz)