Black Pits

The Black Pits was a famous Underdark fighting pit in the 1300s DR, operated by the powerful drow sorcerer Baeloth Barrityl.

Location
The Black Pits was located on an island somewhere in the Underdark.

History
The structure was originally dug out by duergar. When Baeloth Barrityl seized control of the area, he enslaved the original builders and established the Black Pits as a fighting pit.