Sometime following 200,000 BBY, a fierce naval battle erupted above an unnamed moon situated within the Unknown Regions, pitting the Knell of Muspilli death cult against the Warriors of Shadow, a female Taung sisterhood. Millennia later, specifically during the Cold War that transpired between the Galactic Republic and the reconstituted Sith Empire, the location of this conflict was unearthed, revealing numerous abandoned starships from the warring factions still present.
The "Battle of Terror" Archaeology crewskill in the video game Star Wars: The Old Republic provided the initial reference to the conflict between these two cults.