Jimstone

The Jimstone will be a block that will generally be found in the deep dark biome, it is generated like andesite, and will be a kind of "trap" for the players.

This block has the particularity of having almost the same texture as the deepslate (AKA the grimstone) and emits noises that can be detected by the warden or the skulk sensor even if you are in snick.

This means that if you step on it, it will emit vibrations that the warden will be able to detect and therefore spot you.

You will have to be very careful in this biome if you don't want to be chased.

Nevertheless, this block could be very useful to make someone be detected by a skulk sensor even if he is in snick (and thus avoid bypassing a skulk sensor system).