A visor of mists

Stats needed.

A visor of mists is an exceedingly rare out-of-game eyewear item which was carried by the Mist Dragon in Knights of the Round. It is not exceptionally powerful, but it was unique as a warrior-wearable eyewear which granted detect invis, detect hidden, and scry.

One visor of mists was lost by Erdos in a deathtrap in the Abbatoir Asylum. Another is believed to have been lost by Selina upon ascension to immortality (can this be confirmed/refuted?) It's uncertain how many remain extant, or whether any do at all.

Can anyone confirm that this item's name was indeed "a visor of mists" and not "a visor of mist"?