When did raid ICC come out?

The Icecrown Citadel (ICC) raid was released in World of Warcraft on December 8, 2009, as part of the Wrath of the Lich King expansion. This raid features prominent encounters with the Lich King and includes various challenging bosses and mechanics that became iconic within the game. Icecrown Citadel was a key part of the game's storyline and is fondly remembered by players.