'Shiv Dhanush, the ultimate weapon of mass destruction, which could totally destroy all sort of life on earth, if used, had outlived its purpose & was to be dismantled.
'Ravan would have no objection for fighting a decisive battle with Shri Ram, and in case he got killed in battle his followers will return to Pataal Lok after a specified period of time (this is important- because Bali, the earlier Rakshas king had gifted the entire earth to VAAMAN, an incarnation of Vishnu and at that time it was agreed that Rakshas could stay in Pataal Lok). He also assured that under no circumstances civilized life as existing in various kingdoms would be touched provided Shri Ram did not receive any help from them in his battle. It was also decided that this fact would be made public before dismantling Shiv Dhanush.
'Shri Ram would stay as Vanvasi(forest dweller) for a period of 14 years in forest to educate these new evolving human beings about civilized life and earmark the specific areas in the forest which would be suitable for them for proper growth. The 14 years period could start as per the convenience of Shri Ram and towards the end of that period only, the decisive battle would be fought.
Ravan blessed Shri Ram for success in his endeavor.'