Thank you for your feedback! Black Cleaver is included in the build for several reasons. It offers a combination of attack damage, health, and ability haste, providing a well-rounded stat package for Graves. While the armor reduction from Carve may require multiple hits to fully stack, Graves' high attack speed and consistent damage output make it easier for him to apply stacks quickly. Additionally, the movement speed bonus from Rage synergizes well with Graves' mobility and kiting potential. Overall, Black Cleaver enhances Graves' damage, survivability, and team utility in a variety of situations.