The combat arena was the centerpiece of the ancient Yautja ruins on BG-386, an ancestral hunting arena designed to test Predators in combat against an assortment of deadly foes, particularly the Xenomorphs.
It is featured heavily in the 2010 video game Aliens vs. Predator, with all three campaigns featuring a major boss battle that takes place within the arena.
The arena itself is a roughly square pit constructed of ancient stone. The vertical sides are topped with vicious spikes that prevent any prey (or any unworthy Predators) from escaping. The pit itself is filled with tall square columns that provide for vertical combat, as well as giving the arena floor a vaguely maze-like feel. Vents in the pit's floor are capable of spewing flame intermittently for an additional hazard.
The arena was ancient even by Predator standards, and had been host to hunting rituals on BG-386 for thousands of years. It was located in the centre of sprawling ruins that had once been a sizeable Predator settlement.
The arena was the location of a battle between Specimen 6 and its Warrior brethren and several Predators who had been on the planet as part of an initiation hunt before getting caught up in the large-scale Xenomorph outbreak. Two Young Bloods and an Elite Yautja were ultimately slain, with Six personally ensuring the latter became host to a Predalien.
Dark later entered the arena to retrieve an ancient Combistick, but was trapped when the arena's defenses, designed to keep battles contained within the structure, activated. Dark was subsequently forced to fight a Praetorian and its Warrior minions, after which he was able to leave.
Later, Rookie also came across the arena whilst searching for Corporal Tequila, and was finally trapped by a Young Blood Predator that had been stalking him and his fellow Marines throughout the ruins. He engaged the Predator in combat, ultimately defeating it and escaping.
The arena was ultimately destroyed, along with the nearby colony of Freya's Prospect and the Weyland-Yutani research laboratories built around it, when Dark left an ancient Self-Destruct Device to wipe out all trace of the events on the planet.