The brooch of lingering heat was one of the artifacts reserved for the archmage of Menzoberranzan. It was in the possession of Gromph Baenre.[as of when?]

It granted the wearer the ability to fill Narbondel with twenty-four hours of heat, allowing the city's inhabitants to tell time even in the Underdark.[1]


  1. R.A. Salvatore (July 2006). Starless Night. (Wizards of the Coast). ISBN 0-7869-1606-0.