Talk:Varus/@comment-5888252-20130211110653/@comment-146.52.49.77-20130211135631

Voidstaff does not work well with Malady after-all. Abyssal Scepter doesn't either. Both items provide magic resist reduction, which applies before penetration.

100 mr:

-28 mr from Malady

-20 mr from Abyssal Scepter

-35% mr from Void Staff

-8% mr from masteries

-0 mr from flat penetration out of all sources (Sorcerer's Shoes, Haunting Guise etc)

-

31,1 mr

As you can see, the Void Staff only penetrates ~18 mr, which is bad synergy. With just Void Staff and no reduction items, you would already penetrate 35 out of the 100 mr in our example, which can be further amplified by penetration runes and Sorcerer's Shoes (don't like Liandry's too much on Varus).

TL;DR: If you want to go for magic resistance reduction builds, stack flat penetration in addition, because Void Staff is too inefficient.