Aragorn does not have to pay any points for AndNúril, Flame of the West; he automatically has this upgrade - it is free.
Friendly Dunharrow Warrior models within 3" of Aragorn gain a bonus of +1 to their FIght Value.
Whenever the King of the Dead Charges into Combat, after the Charge has been completed, he may spend a Will Point to use this special rule. If he does, enemy models within 3" of the King of the Dead must take a Courage Test in an order chosen by the King of the Dead's controlling player. If the test is failed, the model must Move up to its Move Value directly away from the King of the Dead.