Rama approaches Sugriva again to welcome Bali for a duel and this opportunity to wear a garland. Amid the fight, Rama executes Bali with an arrow going through his heart.
After the demise of Bali, Sugriva turned into the leader of Kishkindha. Bali's child Angad, given imperative obligations in the war against Ravana.
The atmosphere in the beginning is a fog of deceptions as the evil spirits cloud the judgmental of the faithful. By the end of the book, Lucifer has usurped his tongue. Hope this helps :)