ModelEngine - custom mobs
How to merge resourcepacks?
Using ModelEngine with Oraxen is very simple as long as you use different types of items. As far as I know, ModelEngine uses leather horse armor. If you don't, compatibility should be simple.
Go to the ModelEngine folder. It should look like that:

content of ModelEngine folder by @Thew
Open the
resource pack
folder:
content of resource pack folder by @Thew
Copy the assets folder (the folder, not its content) inside
Oraxen/pack
, this should look like this:
Oraxen/pack folder by @Thew