Origin and First Death

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Nox, being ever-resourceful and clever, posed as the goddess of love and beauty, Aphrodite, and seduced Ares, the god of war. Nox, according to her plans, later gave birth to two sons, Deimos, the god of terror, and Phobos, the god of fear. Deimos and Phobos were raised by Nox to do her bidding, and were both sent to apprehend Thor and Hercules. In the battle, both of the brothers were killed.

Second Death

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Not being able to live with the death of her sons, Nox utilized the power of human fear during the Great Fear takeover by the Fear Lords in order to resurrect her sons. They held Clea and Rintrah in their captivity, but were both again killed due to the lack of fear in the humans caused by Doctor Strange, this time at the hands of their prisoners.