Treasure Magnet

The Treasure Magnet is an accessory that pulls items in a 9.5 tile square toward the player and can be found in Shadow Chests as well as the Obsidian Lock Box.

When an item is within its range, before directly flying to the player, it will hover a few blocks off the ground.

Trivia

 * As of 1.4.0.5, the Treasure Magnet is the last accessory added to Terraria going by Item IDs.