The Shattered Sun Offensive, abbreviated as SSO, is an army of blood elf and draenei priests, magisters and warriors raised by the naaru to combat Kael'thas Sunstrider's mad bid to use the Sunwell as a portal to summon his master, Kil'jaeden. Their operations are centered around the Isle of Quel'Danas, where the Sunwell is located. The Offensive is the culmination of a plea for unity between the draenei priests of the Aldor and the blood elf wizards of the Scryers in an effort to prevent Kil'jaeden's summoning, which would result in the end of all life on Azeroth.
The Offensive's main base is located on Quel'Danas in an area called Sun's Reach, on the island's northwestern corner.
The first efforts of the Offensive were to retake Sun's Reach--first the arcane sanctum, then the armory, then finally the harbor from the Dawnblade blood elves loyal to Kael'thas, as well as the demonic forces of the Burning Legion. Members of the Offensive were also called upon to enter the Magisters' Terrace and do battle with the elite of Kael'thas' forces, eventually facing the lord of the blood elves himself and defeating him.