Also known as Lanka kanda, this book describes the Ramayana War between the army of Rama and the army of Ravana. Having received Hanuman's report on Sita, Rama and Lakshmana proceed with their allies towards the shore of the southern sea. There they are joined by Ravana's renegade brother Vibhishana. The apes named Nala and Nila construct a floating bridge (known as Rama Setu) across the sea, using stones that floated on water because they had Rama's name written on them. The princes and their army cross over to Lanka. A lengthy war ensues. During a battle, Ravana's son Indrajit hurls a powerful weapon at Lakshmana, who is badly wounded and is nearly killed.[citation needed] So Hanuman assumes a gigantic form and flies from Lanka to the Himalayas. Upon reaching Mount Sumeru, Hanuman was unable to identify the herb, and so decided to lift the entire mountain and with it, fly back to Lanka. Eventually, the war is over as Rama kills Ravana. Rama then installs Vibhishana on the throne of Lanka.
On meeting Sita, Rama asks her to undergo an "agni pareeksha" (test of fire) to prove her purity, as he wants to get rid of the rumours surrounding Sita's purity. When Sita plunges into the sacrificial fire, Agni the lord of fire raises Sita, unharmed, to the throne, attesting to her purity. The episode of agni pariksha varies in the versions of Ramayana by Valmiki and Tulsidas. In earlier versions this event does not occur and many scholars consider it to have been added later as society became more patriarchal. In Tulsidas's Ramacharitamanas Sita was under the protection of Agni (see Maya Sita) so it was necessary to bring her out before reuniting with Rama. At the expiration of his term of exile, Rama returns to Ayodhya with Sita and Lakshmana, where the coronation is performed. This is the beginning of Ram Rajya, which implies an ideal state with good morals.
