Minecraft wiki entry for Sculk_(disambiguation), associated text: Sculk - A block found in the Deep Dark.
Sculk Catalyst - A block that spreads sculk via the death of a mob.
Sculk Sensor - A block that detects vibrations and communicates them to certain sculk components or transforms them into redstone signals.
Sculk Shrieker - A block that "shrieks" if triggered. Can cause the emergence of a warden if triggered too much.
Sculk Vein - A decorative block found in the Deep Dark.