The Litch King is the King of World of Warcraft. He is hidden deep within ICC. In order to defeat him you would need a raid group of about 10-15 people of different classes. For example you would need healers, at least 2 tanks, dps and magic users. So there would be at least 1 warrior 1 paladin 2 hunters 3 priest 3 mages and 1 of each of the different classes.