From Emperor's Hammer Encyclopaedia Imperia

The Herald of the Dark Brotherhood is in charge of the creation of all insignias and hallmarks that all members of the Brotherhood should carry as well as the creation and distribution of the appropriate Grant of Arms to each worthy Jedi.

The Herald also manufactures the custom lightsabers and lightstaffs that all Jedi may carry once they reach the required rank. Furthermore can the Herald be approached as well for creation of any other Grants of Arms, and Crests of which a unit in the Dark Brotherhood is in need. In matter regarding the award, use, and distribution of Grants of Arms and Lightsabers, the Herald acts with full authority of the Grand Master.