What is the Black Cleaver in League of Legends?

Answer 1

Black Cleaver is an item, which gives you 200 health, 50 attack damage, 10% cooldown reduction, and 10 armor penetration. It also has an unique passive: Dealing physical damage to an enemy champion reduces their armor by 5% for 4 seconds, stacking up to 5 times. This item is very popular on champions that have AoE abilities which proc the stacks easily, like Corki or Miss Fortune. It is also used very often by AD Mids, like Zed and Talon.

Answer 2

It is a legendary item on League of Legends with the following stats:

• +20% cooldown reduction
• +40 attack damage
• +400 health