Mask worn by Suladan in Middle-Earth: Shadow of War.
Comes with multiple variations for cut/uncut files, eyes/no eyes, and strap holders in Raw files if needed!
I use it as decor, however a separate print profile for eye-holes and straps is available if you'd like to wear it.

There are optional tiny alignment pegs I've used which helps with keeping it in the right position when gluing top and bottom.
The ruby/gem parts can be glued on. Bigger ones go to top and bottom, smaller ones go to the sides of the “crown”.