Monochromatic Blocks
This mod introduces a simple monochromatic block that emits light when placed in the world. Most likely, it can be mined with a pickaxe, although the creator suggests that the block might be breakable even with bare hands.
The most remarkable feature is the absurdly high explosion resistance. According to the developer, the blast resistance ranges from one million to one billion units. This significantly exceeds even the most durable vanilla blocks, including bedrock, command blocks, and barrier blocks. The mod author acknowledges that such values appear ridiculous.