Secrets of Mystara
Helm of Telepathy
This magical helmet improves the armor class of the wearer, and allows him or her to both project and receive thoughts so as to be able to communicate regardless of language. The party took this from the Brotherhood of Gorm but then lost it to the Magi. Later, they recovered it from Aurigas of the pyramid Magi and gave it to the undercity Gormites.