Secrets of Ulduar
Released in April 2009 World of Warcraft Patch 3.1
The march of Horde and Alliance armies through Northrend led to a number of victories, but these successes paled before a discovery made by the explorer Brann Bronzebeard within the ancient titan complex of Ulduar. This mysterious fortress had long served as the prison of the Old God Yogg-Saron, a being of unfathomable evil whose influence had spread into the continent of Northrend itself. With Brann's assistance, small bands of Alliance and Horde champions infiltrated Ulduar to confront Yogg-Saron, who blasted the invaders with cryptic visions: the millennia-old creation of an artifact known as the Dragon Soul, the assassination of Stormwind's King Llane, and a glimpse of the Lich King's future.