Wikia

Teleport: Moonglade
Teleport: Moonglade 0.1% of base mana 10 sec cast Teleports the caster to the Moonglade.
Usable by
Class	Druid
Properties
Type	Utility
School	Arcane
Cooldown	(GCD 1.5 sec)
Level required	14

Teleport: Moonglade is a druid-only teleport spell learned at level 14. It teleports the caster to the city of Nighthaven, Moonglade.

Notes

This spell cannot be cast in battle.
Costs no mana.
Can also be useful in the Lunar Festival
Useful for night elf druids, it allows for a short trip to Rut'theran Village, serving the function of a Hearthstone for their hometown. Not so much for Tauren, since the trip from Moonglade to Thunder Bluff, even if free, takes almost seven minutes. (It used to be a longer ride over Darkshore that took 10 minutes, but now you get the direct way through Felwood). If you have the adjacent flight points, it is best to leave from the non-druid flight-path, close to the bottom of the region, and take the shorter trip to Orgrimmar.
Useful also if your Hearthstone is on cooldown and you need to leave a dangerous area, like dungeons or battlegrounds.
With the ever expanding world in subsequent expansions, this spell became slightly more useful, since it allows instant access to Kalimdor, and from Moonglade easy access to Darnassus and Exodar (via flight path) or Stormwind and Orgrimmar (via flying to Mount Hyjal).
Worgen druids who have not completed their starting zone quests will be given the following message if attempting to use this spell: The fate of Gilneas has not yet been decided. You cannot escape yet.

Patch 2.1.0 (22-May-2007): This spell is no longer castable in Tree of Life Form.