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A matter block. A block that matters.
The Matter Block is found in Sci-fi dungeons. Interacting with the container will cause matter blocks to spew out in random directions and stick to any surfaces that they touch. The blocks can damage The Player and enemies as they travel before resting. Matter Blocks are required to craft the Handy Space Helmet and the Neat Welder's Helmet, as well as the Makeshift Armor Set.