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Warning! This page contains spoilers for Aru Shah and the Song of Death.
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Jambavan was the son of Brahma, the creator god, born from the latter's mouth when he yawned. He ruled over the bears in the kingdom of Kishkindha and was present when the Ocean of Milk was churned for the amrita, the elixir of immortality. He learned of the all-curing herb, Vishalyakarni, from the gods there. In his previous life, Jambavan was the king of the Himalayas who was incarnated as a bear in order to serve Lord Rama, an incarnation of Vishnu. Rama gave the bear a boon that allowed him to live a long life and have the strength of ten million lions.
When the wife of Rama, Sita, was abducted by the demon king Ravana, he was advised by Kabandha, the rakshasa, to come to Kishkindha for help. But the king, Sugriva, was overthrown by his younger brother, Vali. Jambavan became Vali's commander-in-chief, but he went back to being loyal to Sugriva after Rama killed Vali. Jambavan was among the scouts Sugriva sent to the south. When they reached Mount Mahendra, they climbed it and encountered a large ocean with Lanka far away. Jambavan made Hanuman realize his immense capabilities and encourages him to fly across the ocean to search for Sita in Lanka. Jambavan does so by mentioning the time he got injured when he was beating the drum for Vishnu when was in his Vamana incarnation measuring the three worlds. Vamana's shoulder struck Jambavan and he was injured which limited his mobility. During the battle of Lanka, he told Hanuman of Vishalyakarni to convey him to help Laxmana who was rendered unconscious and on the verge of dying by Indrajit, Ravana's son.
Jambavan had once killed a lion, who had acquired a gem called Syamantaka from Prasena after killing him. Krishna was suspected of killing Prasena for the jewel, so he tracked Prasena's steps until he learned of the bear that killed the lion. Krishna found Jambavan in his cave and a fight ensued, it lasted twenty-eight days. Then Jambavan began to grow tired submitted after learning of Krishna's identity. He gave Krishna the gem and also presented him his only daughter, Jambavati, who became one of Krishna's wives.
Jambavan arrived at the Night Bazaar with Urvashi, Hanuman, and Uloopi after the thief of Kamadeva's bow and arrow fled. The bear king was later discussing with the other guardians when the Brynne Rao and Aru Shah were blamed for the theft.
Jambavan was a gigantic bear who wore a crown that looked like small constellations knitted around his forehead.