Talk:Katarina/@comment-5855513-20121221132119/@comment-5855513-20121224005722

Flat mpen works exactly the same way flat mr reduction works - the enemy has *number* mr less. Abyssal + Sorcs definitely cover enough flat magic resist reduction, penetration, whatever.... if they do not build heavy mr. And if they do build it, you don't buy another silly flat item, but a Void Staff to really shred them. 3 flat mr items is an overkill, if you ask me.

But hell, whatever works for you :P