Kind of an old thread, but here's what I found in the archived patch notes saved on alla:
Greenmist was confirmed discovered November 2001, so patches prior to that are what I looked through.
Quote:
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November 15, 2000 3:00 am
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***Patch Day***
...
...
-- Fixed all known problems with the class-specific epic quests.
-- Implemented some new race-specific quests for Iksar.
...
...
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Quote:
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March 14, 2001 3:00 am
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***EverQuest Turns Two***
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...
- There are a bunch of new quests as well.
...
...
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Quote:
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March 27, 2001 2:00 am
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Several new quests have been added as well, so don't be afraid to talk
to the folks of Norrath, they might have new information for you.
- The EverQuest Team
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Looks like Velious started December 1, 2000 give or take a day. The Iksar racial quests were last officially released November, 2000 during Kunark era. If any of them weren't implemented on that day, they were either stealth-added or lumped in with the "we were too busy launching and fixing Velious so we added these afterwards" quests mentioned in the March, 2001 additions. There are some patch notes indicating various stages of the quests (Monk shackles, shaman cudgel) being fixed, which would help explain why it may have taken a year for anybody to finally solve and complete the Greenmist quest.
I'd be inclined to say that, while Greenmist wasn't found until the Velious era, it was very likely available during the Kunark era.