Stone Head

Stone Head (ストーンヘッド) is the sub-boss of Jewel Man's stage in Mega Man 9. It's a big boulder with a face. It drops boulders followed by dropping down from the ceiling itself, causing the screen to shake (stunning Mega Man if he wasn't airborne), followed by Stone Head rolling back up using walls. When on the ceiling, it can be brought down quickly by Hornet Chaser.