GameSpy has posted an extensive preview of The Rise of the Witch-king, the new expansion pack for The Battle for Middle-earth II. Expected to arrive on PCs this holiday season, the RotWK campaign takes place in the years after the One Ring leaves greedy Isildur, and the Lord of the Nazgul rises to power over the kingdom of Arnor (Aragorn's peeps). In addition to the 12-mission evil campaign, the new Angmar faction introduces the spellcasting Thrall Master and Sorcerer units, the latter of which can convert fallen enemies into servants of the Witch-king.