Void staff is 35 % pen . If the target is 100 mr , it ' s a 10 % dmg amp . If the target has base mr or 40 mr , it ' s a 7 . 5 % dmg amp . Your values are off . It ' s a 21 % increase against 100 mr and a 11 % increase vs 40 mr assuming no furter magic pen . The main problem with magic pen is , that it only applies to magic damage with shaco doing mixed dmg . This means that he only gets half of the value , as others have mentioned . <| sep |> Depends on what country , there are a lot in Spain and eastern Europe , in northern Europe you can pretty much leave your laptop on a bus station and come back for it 2 hours later . <| sep |> Give it some time . Fights with friends happen all the time . I ' ve known someone since third grade . The way we became friends was because of a silly fight . Friendships are like that . Just be kind .