The Nazgûl tombs

Upon arrival at the forest border of Mirkwood, Gandalf discovers Black Speech graffiti imprinted on an old ruin, coinciding with a telepathic message from Galadriel imploring him to investigate the tombs of the Nazgûl.

When Gandalf reaches the remote tomb of the Nazgûl he founds that they have been revived. He is joined by Radagast, and it is revealed that the Necromancer cannot be a mere human as the Nazgûl answer only to one master. As Gandalf sends Radagast to warn Galadriel of their discovery, Gandalf enters the orc-infested Dol-Guldur and is attacked by Azog.