Shadowforms is an extensive datapack that makes all mobs at light level 0 turn into shadowforms, as well as adding features centered around this mechanic.
In dark places mobs turn into Shadowforms, which are stronger and faster than normally. In bright light, they're slow and weak.
Some mobs are Strong Shadows, which are stronger and faster than regular shadowforms and don't weaken in light. Have fun :D
Blackened Heart is a block that can be obtained by killing Strong Shadows and can be used in a variety of rituals!
Shadowforms adds two new structures, Ancient Villages and Pale Garden Altars. Ancient Villages serve as a smaller counterpart to vanilla's Ancient Cities, and Pale Garden Altars serve as a place to obtain Sacrificial Hearts. Sacrificial Hearts can be obtained from different animals and equipped for different buffs.
For added ambience the datapack includes 1 new music disc, "Danse Macabre" by Camille Saint-Saëns and multiple other classical pieces to set the mood as background tracks.
Shadowforms also includes Shadow Brews, Athames, Orbs of Darkness, Ancient Enchants and more!