Bionicle Mask Inspiration

What masks that you have seen elsewhere (cultures/movies/video games/etc.) make you think that they could exist in the BIONICLE universe?

For me, it would be metal band Behemoth's Nergal's mask from their music video "Ov Fire and Void"


the mask in the picture you posted does exist in Bionicle. It's a bit obscure, but it looks like this


Sarcasm. It makes the world go 'round.

Lord Vladek's mask would have been cool for a villain...

Looks ike the protector's mask!