Diamond Walls used to build a structure in Creative mode.

The second strongest walls in the game. Made from 2 diamonds, these are very costly but useful blocks for making shelters that can withstand attacks from dragons. Although they have great strength, players generally prefer to use them as decor instead to show off their wealth on their world. Diamonds can be used to upgrade weapons, tools, and ammo.
Diamond Wall

A display of the Diamond Wall.

Sadly they can get destroyed by reckless shooting with a RPG and the undead dragon.

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