This peculiar warp anomaly lies at the edge of the galaxy. It's part of the belt of warp storms that separates Calixis from the Halo Stars. More specifically it sits trailing of the Koronus Passage and rimward of the Spinward Front. The sorcerers say that all manner of reavers and daemons are emerging from the Vortex (it is usually a closed circle, more likely to suck things in than let them out). If this is true it could prove an excellent distraction - and a source of possible allies/recruits. It's a long way off though.