Wikia

The Sanctum of the Sun^{[55, 48]} is located to the southeast of Tranquillien, still in working order, and the magisters who are tending to it give a number of level 15-20 tasks related to saving the Ghostlands from the Scourge and other invaders, including the Night elves. The building is guarded by a few Ghostlands Guardians.

Behind the building, there is a secret passage through the mountains to Tranquillien, which saves a lot of time when travelling between the two areas.