Ryze's rune prison
I can even deal with its damage, my problem is how it works. It's a PRISON, you can see through it, it's description and behavior tell us that it is essentially a damaging root, but even though you can cast from within it, you cannot normal attack, EVEN if you are ranged and of course your target is in range.
Because you can't normal attack from within rune prison, this is effectively a stun for all dps'ers, especially the ranged ones who might actually be able to fight back, and with some luck or lifesteal (which is completely worthless when you can't attack) you might actually be fine or even turn the tables if they stick around. This should not be.