After the death of Isildur and subsequent disappearance of the One Ring, the Witch-king of Angmar plans to attack the Dunedain kingdom of Arnor and take control of the north.After the death of Isildur and subsequent disappearance of the One Ring, the Witch-king of Angmar plans to attack the Dunedain kingdom of Arnor and take control of the north.After the death of Isildur and subsequent disappearance of the One Ring, the Witch-king of Angmar plans to attack the Dunedain kingdom of Arnor and take control of the north.