Talk:Weapon Expertise (Season 2012 Mastery)/@comment-71.163.66.129-20120216212125/@comment-49.178.5.25-20120430092453

... 40% is the cap on percentage reductions... Just a theory, cause CDR and MP cannot go over 40%, why should ArPen%?

"Flat penetration is added before % Pen"- from mobafire