The zone to sky was to isle 1. At least it was by Velious. Once we cleared VP, and in some kind of frenzy we all zoned to sky and killed all the quest efreeti's.
Also, the chance for a see invis wurm is low enough that you can sometimes get only 1-3 on the way to a dragon. We used SK's with circlets of shadow to pull the dragons, and we always had to kill 1-3 see invis wurms before we could pull the dragon solo with the circlet.
-Xasten
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