The Coin of Fortune is an item added by Xeno's Reliquary. It can be toggled with right click. While toggled on, it will glow and pull items and experience from the ground towards you in a 5 block radius.
Somewhat contrary to the description, it will instantly bring items and experience to your position instead of slowly dragging it.
As of now, the Coin of Fortune has infinite durability, allowing one coin to last you a lifetime.
When it is active, you cannot drop items as the Coin will always drag it back to you.