Fantasy Indices, Another game to my League

I am lucky enough to have something new in my first research of 3D format in 2017.
That indices! In the geometry files. There are some indices between "block data".
I cannot found anything meaningful reason to have these indices(Protection)!?
For animation files, it just data without any relation!?

It still in WIP, with quick and dirty way. I am able to get most models and animations imported!
Good enough to show them here! :)

Here is the file in the Video (No Textures included)