Terminal Soot

Terminal Soot is the main underground block in the Terminal dimension. It has no special properties, it's literally just stone but mined with a shovel because it's soot. The one quirk of mining in the Terminal dimension is that Terminal Soot is very dark, and even though the dimension has global lighting (like the Nether), it is hard to see in caves, and torches don't help, you'll need to use your eyes.