Quintessa is the homeworld and sanctuary of the Elementals. Most Elementals live there and never voyage elsewhere, and thus it is unusual to see an Elemental off of Quintessa. In addition, few humans ever go to Quintessa. Elemental envoys are occasionally sent to other planets, though. Aereon was one such ambassador, and was sent to Helion Prime to advise them on the Necromonger threat.
The Lord Marshal Zhylaw considered targetting Quintessa for invasion, and blackmailed Aereon into telling his future by saying that he would leave Quintessa as his last target. However, this assault would never take place after Riddick killed Zhylaw.