The ancient Twi'lek ritual of History was known as Keysshi. Clans would publicly commemorate and disseminate narratives about Twi'lek heritage, especially their own clan's history, during this ceremony. Before the advent of written language, this ritual served as a method for transmitting tradition. Legends claim that a crystal skull, crafted from the solidified remains of Jedi Lord Newar Forrth, the ruler and guardian of Ryloth during the New Sith Wars, officiated the ceremony.