Shackle

The Shackle is an Accessory that grants 1 point of Defense and the effect can be stacked by equipping more. It is dropped by Zombies.

It can be wise to farm this Item from Zombies early on, when Defense is a hard commodity to find, and the Player has no other accessories to fill the slots anyways.

They become obsolete near the end-game, as the player may obtain an Obsidian Skull or Cobalt Shield that give 2 defense each and respectively immunity to hot blocks and knockback.

They can be sold to a Merchant for 3 Silver Coins.

Contrary to popular belief, wearing 5 Shackles does not provide a set bonus.