Sculk

Sculk is a decorative block found in the deep dark biome, or created by the sculk catalyst.

Breaking
Sculk blocks can be mined with any tool, but hoes are the quickest. It always drops 1 experience if mined without Silk Touch.

Natural generation
Sculk are generated in patch formations within the deep dark biome.

Post-generation
Sculk blocks generate when a mob dies within 8 blocks of a sculk catalyst, replacing any blocks with the  tag in the area.

Usage
When wool blocks are placed on a sculk block, it will let nearby sculk sensors know, preventing that vibration from being occluded.

Development images
Images are sorted by their approximate creation date.

Trivia

 * "Sculk" is derived from "skulk," meaning "keep out of sight, typically with a sinister or cowardly motive".