Ball O' Hurt

The Ball O' Hurt can be found by smashing a Shadow Orb, or by defeating the Eater of Worlds. The Ball O' Hurt has the lowest damage compared to the Blue Moon and Sunfury, but oddly, it sells for 54 silver coins, which is the same price Blue Moon sells for, despite the fact that it's stronger and more rare.

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At a certain angle (slightly lower than shooting straight) you can shoot through a wall thats right in front of you. If a player stands next to a door and fires a flail out of the door while closed, the flail will go through the door.

If you attack with the Ball O' Hurt and continue to hold down the button the ball will continue to stay on the screen and will follow you and damage any enemies that touch it. It also has a limited range this way and will fling back if it gets too far away. Also, if it gets stuck behind a block that's between the ball and you, and you continue to walk away, it will automatically return to you when it gets too far away, similar to if you let go of the mouse.