Graal Kingdoms: Lost Metris Bones

[Drakeero]

Many years back, someone introduced metris bone clubs into the game. I saw 3 colors but I suspected there were four; white, black, red, and gold.

To date, all my older versions of graal do not have these images in their folders and I cannot find their archetype on debug.

I'd like to use them in an upcoming event and I'd like to ask if anyone knows where and what they are.