Dungeon Bricks

Dungeon Bricks are a non-craftable type of brick from which the Dungeon is constructed. On world generation, one of three colors of Dungeon Brick is chosen to create the entirety of the Dungeon. Dungeon Brick is one of very few block types that is impervious to explosions. 100% Pickaxe power (a Molten Pickaxe or better) / 65% Pickaxe power (a Nightmare/Deathbringer or better) is required to mine Dungeon Bricks in the Underground-level Dungeon, although any pickaxe can destroy Dungeon Bricks at or above the Surface layer, and any Dungeon Bricks placed within the center third of the world.

History
Briques de donjon 던전 벽돌 Tijolos do Calabouço Кирпичи темницы 地牢砖