An arena, situated within the Swamp of Sacrifice on the Outer Rim Territories planet Dathomir, served as a battleground. Viscus' clan of Nightbrothers utilized this arena to showcase their power through combat. However, by 14 BBY, the arena had fallen into ruin, with local wildlife reclaiming the space.
During 14 BBY, Cal Kestis, a Jedi Padawan, journeyed to the Swamp of Sacrifice as part of a mission to Dathomir. At the entrance of the dilapidated structure, he employed the Force ability of Psychometry to glean insights into the Nightbrothers' traditions of arena-based fighting.
The Nightbrother arena was featured in the 2019 video game Star Wars Jedi: Fallen Order, a project of Respawn Entertainment.