I came up with a mask of sight for a short story I was think of writing, the mask would allow its user to see through the eyes of a random sapient being in their vicinity. The down side to it, other than possibly having to activate it a number of times to see through the eyes of being you want to, is that while in use the user can't see from their own, which could be a problem if they were on there own, but it would come in handy if they saw through the eyes of one trying to sneak up onon, or hiding from, them. Also a mask that prevented beings in the area from using any natural abilities, ex: to a couldn't acsses their elemental powers, The Shadowed One his eyebeams, Skakdis any of their three powers, Makuta all fouty-two of theirs, even a De-matoran would lose their sensitive hearing, but when activated it would affect its user as well, other wise most fights would be rather unfair. Oh and a mask of stasis, not sure to make the affects only temporary or to have it that direct eye contact is required, actually thought of a story where a Toa became a living statue after being tricked into using it on a mirror. Anyway, those are some I came up with over the years.