User blog comment:Centuriarch/Different ADC build./@comment-5035765-20140312231541

mmmmmmmm

naaaaaaaaaaaah

for the simple reason that you're hardly ever going to find enemies standing close enough to each other to acually make use of Runaan's.

I mean, there's only two characters off the top of my head that really benefit from it; Varus, who uses it to spread out his Blight stacks in an AP build, and Teemo, who uses it to spread out his poison... in an AP build.

basically, you don't build a Runaans for AD damage, you build it to make your on-hits multitarget.