Talk:The Black Cleaver/@comment-1818317-20150116020927/@comment-26140213-20150224142240

The first passive (flat penetration) doesn't stack with itself, but it used to. The second passive (% penetration) stacks if you buy multiple Black Cleavers and/or your teammates buy them as well. This can bring resistances into the negatives if you have enough stacks. The idea is tempting, but his highly impractical and difficult to accomplish.