For setup instructions please see the fabric wiki page that relates to the IDE that you are using.
Currently, this mod adds 16 new Origins, one is unfinished, and they are all based off of myths.
These Origins include:
Basiliskion
Centauros
Chimerog
Cyclopian
Elvon
Faery
Fenren
Harpnian
Hydranian
Impling
Lamian (unfinished)
Minotaurion
Ogrelin
Phoenixkin
Sirenos
Werewian