Had this drop 4-5 times during a wizard wpic 1.5 fight.
When in Sol B, look at your in-game map. The center south section is a dead end (straight east from the succor point). Move to the room before the southmost room in this dead-end path and start killing until it drops. Groupable at least and possibly even soloable by a 65 rogue with a merc healer.
You might happen to trigger the Wizard 1.5 event (not sure if you can without having a wizard at the proper point in quest in the zone, though). The Wiz 1.5 event is not hard at all, and the end mob drops a few items worth a good tribute.
It was said originally that they may get rid of it after a certain time but proved popular enough to stay there I guess. Now that the Rogue epic part is there even more reason for it to stay.