what is the relation between kuber and ravan in mythology
Kubera Originally described as the chief of evil spirits in Vedic-era texts, Kubera acquired the status of a Deva (god) only in the Puranas and the Hindu epics. The scriptures describe that Kubera once ruled Lanka, but was overthrown by his demon half-brother Ravana, later settling in the city of Alaka in the Himalayas. Descriptions of the "glory" and "splendours" of Kubera's city are found in many scriptures.
Radagast Radagast the Brown is a fictional character in J. R. R. Tolkien's Middle-earth legendarium. He is one of the Istari, also known as "Wizards", who were sent by the angelic Valar to aid the Elves and Men of Middle-earth in their struggle against the Dark Lord Sauron. Radagast appears in The Lord of the Rings and Unfinished Tales, and is mentioned in The Hobbit and The Silmarillion.