This is what i got from Kaal Ratri
Kalaratri in Purana glossary... « previous · [K] · next »
Kālarātri (कालरात्रि, “the night of time”) is a name of the Goddess Raudrī referring to her terrific form engaged in destruction, according to the Varāhapurāṇa chapter 96. Raudrī is the form of Trikalā having a black body representing the energy of Maheśvara (Śiva). Trikalā is the name of a Goddess born from the combined looks of Brahmā, Viṣṇu and Maheśvara (Śiva).
Source: Wisdom Library: Varāha-purāṇa
Kālarātri (कालरात्रि).—The Devatā presiding over the night on the eve of death. The fierce aspect of the Devatā is described in the Mahābhārata as follows:—
Coal-black in colour, with swollen mouth and eyes and wearing red garlands and clothings—thus appeared the woman (Devatā) presiding over the death-night. With the fierce cord in her hand she drags away the souls of the dead. (Sauptika Parva, Chapter 9).
Source: archive.org: Puranic Encyclopaedia
So basically Pratipada Amavasya takes place in the period of time when death looms over Daayanvanshi's - KaalRatri according to Nazar lore I think !