The Shadow Kingdoms

The mod adds a new dimension call "Eldoria" (that includes the vast majority of its content). So we recommend

 creating the guide book that the mod adds to guide you on your journey.

To create this book you need to first sleep with a recordable book, then when you wake up follow the instructions given by the book, then go back to sleep and repeat the process until you manage to do vademecun thaumaturgy (the guide book).

NOTE:

For the mod to work correctly, it requires 2 mods which are:

Geckolib vertion 4.4.4: https://www.curseforge.com/minecraft/mc-mods/geckolib

Curios API: https://www.curseforge.com/minecraft/mc-mods/curios