Jai Sri Ram,
All three brothers practice austerities of various kinds which complete Brahma to award them boom of their desire, Ravana requested Brahma that My prayer is to have undisputed sovereignty on all the three spheres and at that span, I should die at the hands of none except monkey and men, SO BE IT. said Brahma,
Then approached Kumbakarana and diluted his mind before asking his wish, Kumbakarana prayed for six-month sleep, a powerhouse of might to defeat anyone in the battle except Sri Hari, then Brahma approached Vibhishan and Said asked a Boon, my son, He asked pure love for the lotus feet of Lord Sri Hari Vishnu,
Now Ravana becomes the demon king because of his deeds and truth, his eldest son Maeghanatha was a warrior that none other can ever be, in their race there were many champions the embodiment of might and storehouse of power,
They assume the form of demonic Maya and deceive the creature the way they will and wish, creating havoc for even gods, Meghanatah roared again and again at gods, challenge them but scared of the greatest demon from Ravana they take refuge in mystic caves, By the might of his arms, Ravana subdued the whole universe and left no one independent, ruled the world according to his own will,
May Lord bless all,
Thanks, please