Who abides in all beings and is called Vishnumaya.
As Vishnu Maya, she releases Lord Vishnu from her Maya , who kills both Asuras (thoughts manifested in the form of Madhu- excessive thoughts and Kaidabha - less thoughts who trouble Lord Bramha and prevented him from creating) after wrestling with them for thousands of years. While She kills them with just her delusion. Due to her Maya and Moha the asuras, in turn, ask Lord Vishnu to ask for a boon and Lord Vishnu asked them to be killed by him. Thus the great excessive thoughts (Madhu) and lack of creative thoughts (kidabha) were vanquished. Since both these Asuras were of Tamasic origin, she also had a tamasic form.
Gratitude to my Guru Ishaputra- Kaulantak Nath, who bestowed his divine wisdom onto me and Inspired me to read, research on Durga Sapthshati.