Sculk Vein is a thin, non-solid overlay block introduced in Minecraft 1.19, the Wild Update, generating naturally in the Deep Dark biome deep below Y=0. Sculk Vein spreads outward from a Sculk Catalyst whenever a mob dies nearby: the catalyst consumes the dropped experience and converts surrounding blocks into sculk, sculk veins, sensors, and shriekers. Sculk Vein is a multiface block that attaches to any side of a block — walls, ceilings, and floors — just like Glow Lichen, and Sculk Vein can also be waterlogged. With a hardness and blast resistance of 0.2, Sculk Vein breaks almost instantly, and a hoe is the fastest tool for clearing it.

Sculk Vein drops nothing and grants no experience when broken normally; only a Silk Touch tool lets Sculk Vein drop itself for reuse. Unlike the sculk block, Sculk Vein does not spread sculk on its own and triggers no redstone, making Sculk Vein a purely cosmetic accent. Builders use Sculk Vein to add a creeping, corrupted texture over deepslate, stone, and dark builds, framing Sculk Sensors or layering an alien organic look across haunted ruins and Deep Dark recreations.