Talk:Dominion/@comment-4205411-20110927171545/@comment-3360527-20110928213834

The penetration aura helps against trinity tank builds and atmog/fratma builds to keep the game fast paced. The reason (I assume) that armor is 15% and magic is only 5% is because most champs have a low non scaling base magic resist while they all gain armor on level so at high levels without tank items most champions have higher armor and low MR.