Xibalba (Mayan pronunciation: [ʃiɓalˈɓa]), roughly translated as "place of fear", is an underworld better known for its presence in Mayan mythology. It's entrance is believed to be located somewhere in the American continent, and its only accessbile during a period known as the Unnamed Days, five days at the end of the Mayan calendar. This period draws paralels with the five days at the end of the Al-Antidian calendar, which may have been the origin for the Mayan Unnamed Days.
The land of the dead was mentioned by the Professor after reading a report in which an unidentified agent of the Consortium discovered the location of an item which the Professor sought.
- Dominus Mundi (Mentioned only)