As I think other users of project korra might have noticed, there are missing features at project Korra. For example - wihout the spirit add-on, we can't use the spirit bending. Also, being able to put jar files, or custom abilities of project korra would be interesting
The site bellow is for the add-on. The other underneath it for custom moves
https://projectkorra.com/forum/resources/spirits.323/
https://projectkorra.com/forum/resources/categories/custom-abilities.3/?page=1
Also a link for other essential add-ons
https://projectkorra.com/forum/resources/categories/projectkorra-side-plugins.4/?page=1