The only zone out was to Sky. Thought it was in Phara Dar's room, but I can't remember for sure. I'm not 100% sure, but I could swear it ported you to Eye of Veeshan. The location was near a Pad, with a Pile of gold and treasure chests around it, if I recall correctly.
Rapters didn't see invs as you can see by the Invs on the names of us old folk running like mad men past them. SS of said event
Some Wurms didn't see invs all the time. I remember if you killed a see invs one, the chance of a non see invs one spawned.
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Racnar and Lava Drake's were 2 min respawns.
Not sure about the color of the guards,we typically used res pulling in VP. So I can't recall killing them.