I can confirm it is possible to get outta there and all you need is Invis. My Iksar SK made it out with CoS. Some mobs have see invis and some don't. My asshole was puckered up the entire time somethin fierce, but I made it without even getting aggro. If you can make it inside the firewall without aggroing, that is the hard part.
Get in the temple and find the exit, I believe it is on the 3rd or 2nd floor. This is your mission. Do not fail.
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