Dimbhaka

Dimbhaka was a mighty daitya king and the brother of Haṃsa. Together they received a vara (a boon) from Bhagavān Śiva that made both unbeatable as long as both stayed alive. After Bhagavān Kṛshṇa killed Haṃsa in the Kāliya-hrada, Dimbhaka knew his own defeat was now certain under the terms of the vara, and he ended his own life. This is told in the Bhavishya Parva of the Hari Vaṃśa Purāṇa.

Śiva’s vara and shared strength

Dimbhaka and his brother Haṃsa received from Bhagavān Śiva a vara that made them unbeatable together. As long as both were alive, no force in creation could defeat either. Their bond added to the strength of each. But the vara also left each exposed: the death of one meant sure defeat for the other. (Hari Vaṃśa Purāṇa, Bhavishya Parva, Chapters 104–106)

The great war at Pushkara and Govardhana

Haṃsa had insulted Durvāsa Maharshi and then demanded tribute from Dvārakā, and nobody answered. The two brothers then led a huge daitya army against the Yādavas. Dimbhaka fought beside Haṃsa in the two-day battle at Pushkara and at Govardhana. He led part of the daitya forces and fought the Yādava warriors on the field. (Hari Vaṃśa Purāṇa, Bhavishya Parva, Chapters 110–128)

His death after Haṃsa was killed

When Bhagavān Kṛshṇa killed Haṃsa in the Kāliya-hrada, the news soon reached Dimbhaka. He understood what Haṃsa’s death meant: the vara no longer protected him, and his own death was now certain. He chose to die by his own hand rather than at the enemy’s. He took his own life soon after his brother’s death. (Hari Vaṃśa Purāṇa, Bhavishya Parva, Chapters 128–130)

Sources

• Hari Vaṃśa Purāṇa, Bhavishya Parva, Chapters 104–130