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A matter block. A block that matters.
The Matter Block is found in Sci-fi dungeons. Once you find a red container, with four guards protecting it, if you interact with it, it will cause matter blocks to spew out in random directions and stick to any surfaces that they touch, the container then no longer provides them. 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.