Chain

Chains are metallic decoration blocks.

Natural generation
They generate in bastion remnants.

Placement
Perhaps counter-intuitively, chains do not require a supporting block to be placed and can exist completely free-standing.

From block loot
Chains can be mined using any pickaxe. If mined without a pickaxe, it drops nothing.

Info
Chains can be used to suspend lanterns (alongside their soul fire variant), and the chain texture connects to the chain of the lantern seamlessly. However, bells cannot be attached to chains, despite the fact that they fit otherwise via and other methods.