Sculk

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Sculk blocks are decorative blocks found in the creative inventory, and created by the sculk catalyst.

Breaking
Sculk blocks can be mined with any tool, but hoes are the quickest, it drops experience if mined without silk touch.

Sculk Catalyst
Sculk blocks generate when a sculk catalyst is in range of where a mob dies, replacing any grass blocks, dirt, coarse dirt, stone, deepslate, andesite, diorite and granite in the area.

Usage
Sculk blocks are currently used as decorative blocks, but are also a good source of extra xp from mob kills, being usable in mob farms.