Jalandhara is a demon mentioned in Hindu scriptures who was born out of the union of the fire from Shiva's third eye and the ocean.

Jalandhara is a demon mentioned in Hindu scriptures who was born out of the union of the fire from Shiva's third eye and the ocean. It's mentioned in Shiva Purana, when Indra and Brihaspati were going towards Mount Kailash to meet Shiva, their way was blocked by yogi with matted hair and a radiant face. The yogi was Shiva himself, who had taken the form to test the knowledge of Indra and Brihaspati. Indra did not recognise the yogi and was infuriated at him. Indra threatened him with his thunderbolt. Upon this action Indra's arm became paralysed and Shiva neutralised the thunderbolt. Shiva became angry and this anger caused Shiva's third eye to open, nearly killing Indra. Brihaspati recognised Shiva and requested him to pardon Indra. To avoid killing Indra, Shiva sent the fire from his eye towards the ocean and this effulgence upon meeting with the ocean assumed the form of a boy. This incident happened at the place where the river Ganges submerged into the ocean and is known as Gangasagar nowadays. This boy cried terribly which caused Brahma to descend from heaven. Brahma then said that the boy will one day become the emperor of Asuras, he could only be killed by Shiva and after his death he would return to Shiva's third eye.
Jalandhara grew up to be the emperor of Asuras, made by Shukra, their guru. Jalandhara was exceedingly powerful and is considered to be one of the mightiest asuras of all time. Jalandhara once sends his messenger Rahu to Shiva and accuses him of hypocrisy, pointing out that Shiva claims to be an ascetic but keeps a wife, Parvati. He proposes that Shiva hand over Parvati to him. Upon hearing these insults Shiva becomes so angry that a fearsome creature (Kīrttimukha) sprang from his brow and nearly killed Rahu, the messenger who had delivered the demand. War being determined on, Jalandhara marched to fight Shiva. He surrounded the mountain with his troops. Parvati then urged Shiva to enter the war. Upon seeing Shiva and his avatars dominate the battlefield, Jalandhara created an illusion of beautiful apsaras singing and dancing. This distracted Shiva and his army. Meanwhile, Jalandhara disguised himself as Shiva and went to Maa Parvati in order to trick her. Parvati recognised him and became very angry. Puranas states that on recognising this deception, Parvati was so enraged that her eyes turned blood red and her face, pitch black indicating her assumption of her form of Kali. She attempted to attack him but Jalandhara escaped knowing he was no match for the goddess's anger. Jalandhara then engaged Shiva in battle, who killed him by thrusting his Trishul into his chest and cutting his head off with a chakra created from his toe. Upon his death his soul merged with Shiva.!
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