In the depths of the Sculk remnants, there are bones of extinct mobs that have been sculkified and more resourceful. Sculk bones can be used to starcraft reinforced deepslate, or dropped as bait for The Congregation if you're getting chased by it (if there's enough). but the main focus is what's inside the sculk bone blocks, there's a chance that a sculk bone block will have Sculk marrow inside it, Sculk marrow is an ingredient item that can be used to make new food items, and can be used to brew a new potion.
The new effect, "Silenced", when applied, any sound you make is gone, walking, running, landing, even mining is silenced. Useful when in the deep dark.
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