The Kirin Tor Offensive is an Alliance faction introduced in Patch 5.2: The Thunder King. Their base of operation called Violet Rise in the Isle of Thunder, and their force is composed of the Silver Covenant combined with warriors and mages of the Kirin Tor. Their main goal is to prevent the Horde from obtaining the powerful artifacts held by Emperor Lei Shen and also to fight the coalition of Zandalari and mogu.
After Jaina Proudmoore discovered that Sunreavers helped Garrosh Hellscream steal the by using Dalaran portals to infiltrate Darnassus, Jaina mobilized the Kirin Tor, Alliance forces, and the Silver Covenant to purge the Horde from Dalaran. After which, Jaina pledges the Kirin Tor to the Alliance.
During the purge, Jaina imprisoned , but later Horde players rescued him from Dalaran and took him back to Silvermoon. Aware that it was the consequence of Garrosh's irresponsibility, created the Sunreaver Onslaught and launched an offensive against Lei Shen to claim his power and use it against Garrosh Hellscream when the time comes...
The Kirin Tor discovered Lor'themar Theron's plan and created the Kirin Tor Offensive to prevent them obtaining Lei Shen's power.