This add-on pack includes a few of items and blocks of sculk and deep dark, four new structures, and the new deep dark biome. And a new event called "Sculk Aporkalypse", everything is still in development, MUCH MORE new features will be added in the future.
Select version for changelog:
Changelog
Items: Add soul bottle, soul, sculk compass, crystal of soul, crown of convenant, package.
Blocks: Add runes block, death totem, reinforced deepslate, soul catalyst, soul fungus, soul siphoner, sculkcalculus, sculkcalculus bricks, polished sculkcalculus, sculkcalculus altar, sculkcalculus pillar.
Structures: Add the altar