Talk:Riven/@comment-4947142-20121108181136

The Black Cleaver 
 * +45 Attack Damage
 * +10% Cooldown Reduction
 * +10 Armor Penetration
 * Passive: Dealing physical damage to an enemy reduces their Armor by 5% for 6 seconds. This effect stacks up to 5 times on the same target.

The new Black Cleaver. Looks pretty good on Riven.