Talk:Kayle/@comment-4881935-20130118012005/@comment-2124153-20130118152748

It's always been this way, it just wasn't as obvious because flat pen used to come before %pen.

However, just because %pen/%shred stack multiplicatively, that's no reason to avoid them, or say that they don't synergize. They stack that way because they'd be stupid OP otherwise. You still would want to combine them to maximize damage in certain circumstances, because good sources of penetration and reduction are limited.