Used to hear that several zones were "preconditioned" to link to new zones in the future. They never panned out though:
1. The Hole = possible zone-out (to Plane of Mischief?) at the very bottom. I've heard this one a great number of times.
2. Shadowhaven = zone-out (in the caster area) to some unnamed high-level zone, supposedly this zone had something to do with the dark history of Shadowhaven, according to the lore the NPC's told me. When Zirumkin stands up against this door and casts Eye of Zomm, the scouting eye actually appears on the other side of the door (heh, it's a gnome thing) - but the second after I send my "eye" down the passage, the eye stops working.
3. Shadeweaver's Thicket = zone-out to some high-level fire-related zone out by the Firehopper's (?) area. There's even a fire elemental guardian in front of the passage that dead-ends, completely submerged in lava.
4. Gulf of Gunthak = there is a passage in the water that is blocked by a large iron gate - I've heard a few say over the years that this was supposed to be a - what else? - a zone-out to another part of Ykesha. Would kinda make sense because Ykesha only has about 7 zones. Perhaps the designers intended for this expansion to be larger originally?
No doubt other folks will notice other zones that seem to have been destined for future zone-links that never were.
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If you can't do something well, learn to enjoy doing it poorly.
My Rathe / Prexus characters:
Bigbronze Bloodyaxe, 62 Ogre Berserker
Verbeeg Bearfang, 62 Ogre Beastlord
Glabrezu Spiritcaller, 62 Ogre Shaman
Zirumkin Zenomorph, 62 Gnome Wizard
Korgulon Soulwraith, 76 Ogre Shadowknight <Shining Alliance>
Incarnadine Summoner, 65 Drakkin Magician
Bristlebane characters:
Zalkahriz Ebonscale, 64 Iksar Necromancer
Gnomorre Gniceguy, 55 Gnome Rogue
Whytfire Lonewolf, 55 Woodelf Ranger