Where to farm Critical Rate Scroll(Medium)

[Tenrai]

Where do i farm this tedious item?

[whitetrash]

At the golden en......... Can't do it

[kakaka]

i see what u did there

[Vivisepulture]

i see what u did there

Alas, your vision is quite correct, as I too, saw what he did there.

[Andromansis]

I believe that +4 double slotted equipment will max out the number of scrolls dropped at 4, or at least increase the odds of getting max scrolls so significantly that you'll get it 9 times out of 10.