Pony Fantasy VI Remake

Maybe they layer based on Y position (or X/Y position) so anything higher on the screen will be drawn first and have the lowest layering priority.

I've not used monster formations much so I'm guessing here based on that everything else seems in order.

EDIT: I did some quick tests. Sprites closer to the bottom will overlap (has priority over) sprites closer to the top. If sprites have the same Y position their X priority will be first monster in data overlaps latter monsters in data.