The unearthly sound echoed across the faire over the din of the crowd. An apprentice trying to make some extra coin had found a way to utilize his training tool. While this would scandalize his master and his peers, the common folk were mesmerized by the unique sound this instrument performed.
This is a quartet of low-magic rings that can be used separately or as a set.
There is a land where every person wears spectacles. Those without eyeglasses are considered to be the lowest stratum of society, so adventurers without glasses are treated like outcastes. It certainly would explain those heroes wearing sunglasses for no apparent reason...