Mystical World is the a mod designed to make your world a bit more mystical. This mod is light weight, adding only small features to really keep a magical, but vanilla++ vibe. Mods such as Roots 3 will require this mod as it adds necessary components for it to function (primarily, the mobs).
Harleyoc1/MysticalWorld
Library mod for use with the Mystic Mods (Embers, Roots, Gadgetry, Mystic World, etc.)
JavaMIT