Talk:Zyra/@comment-4664737-20121023100658/@comment-4999395-20121111112312

"with ur flat penetration u will penetrate the mr down to 69.5mr and afterwards the 46% from void and masteries. now the enemy has 37.53 mr

if u would buid only a voidstaff and have the mrpen mastery u would penetrate his mr down to ~53

this makes a difference of 15.39 mr"

Read this again, flat pen is first then %, so if some one have 100mr -20 sorc boots, and then 50% from void and mastery you melt 60mr, but if you buy only void you will melt 50% from 100mr so 50mr, so in conclusion you lost 10pen in boots (you bought 10pen instead of 20)

TL:DR ; when you buy void and sorc you will gain from sorcs only 10pen instead of 20