Azsuna was once a mighty night elven empire before the War of the Ancients that was led by Prince Farondis. However, once Farondis planned to destroy the Well of Eternity using the Tidestone of Golganneth, Queen Azshara destroyed it, thus turning Farondis' people into ghosts, and earning him a bad reputation. For ten thousand years they resided in Azsuna as ghosts of their former selves, until the Burning Legion's third invasion of Azeroth, when Prince Farondis journeyed with the adventurer to reclaim the shattered Tidestone, and along the way slew Tidemistress Athissa, earning his reputation among his people again.
The Illidari also have a presence here, and are combating the Legion at Faronaar.
Azsuna is one of the leveling zones in World of Warcraft: Legion.