From WoWWiki

Lariss Pavillion is a large outdoor Night Elf style building in Feralas just north of Camp Mojache. It is one of the fifty elder destinations of the Lunar Festival quest.

The Pavilion is home to a mysterious man named Azj'Tordin. Apparently a Highborne who disagreed with Prince Tortheldrin, he left Dire Maul via means of a backdoor located at the bottom of the Pavilion, but not before an imp by the name of Pusillin stole his book of incantations. He asks passing adventurers to retrieve his spellbook, in exchange for his Crescent Key which he no longer needs. The key is essential in exploring further into the dungeon.

Subzones of Feralas

Camp Mojache • Dire Maul • Dream Bough • Feathermoon Stronghold • Feral Scar Vale • The Forgotten Coast • Frayfeather Highlands • Gordunni Outpost • Grimtotem Compound • High Wilderness • Isle of Dread • Jademir Lake • Lariss Pavilion • Lower Wilds • Oneiros • Rage Scar Hold • Ruins of Isildien • Ruins of Ravenwind • Ruins of Solarsal • Sardor Isle • Shalzaru's Lair • Thalanaar • The Twin Colossals • Verdantis River • Wildwind Lake • Woodpaw Den • Woodpaw Hills • The Writhing Deep