[Question] Drop rate how to count ?

It exists as a Legendary Rank primary line I believe.

How many Cubes have you spent on your earring? Could possibly be bad luck. For sure it exists, I've seen items with it.

Drop Rate: +#incRewardProp%
optionType: Accessories
1 Drop Rate: +10%
2 Drop Rate: +10%
3 Drop Rate: +10%
4 Drop Rate: +15%
5 Drop Rate: +15%
6 Drop Rate: +15%
7 Drop Rate: +15%
8 Drop Rate: +20%
9 Drop Rate: +20%
10 Drop Rate: +20%
11 Drop Rate: +20%
12 Drop Rate: +20%
13 Drop Rate: +20%
14 Drop Rate: +20%
15 Drop Rate: +20%
16 Drop Rate: +20%
17 Drop Rate: +20%
18 Drop Rate: +20%
19 Drop Rate: +20%
20 Drop Rate: +20%