As we have stated many times before, the upāsanā of Nṛsiṃha is of special significance in Bimbāmbikā sampradāya. Here, Nṛsiṃha is not merely an incarnation of Mahāviṣṇu but is a complex and esoteric form of Svacchanda Bhairava, the primary Guru of Nirvāṇasundarī Krama. There are two approaches here, one based on the Navātmeśvara krama of Paścimāmnāya, and the other is based on Mahāmanthāna Bhairava mata of Uttarāmnāya. As our chosen path of sadhana is the second, details presented here reflect the mata of Uttarāmnāya.
Like in the case of Srīvidyā where the Pañcapañcikā are invoked as states leading to nirbīja samādhi within the Bindu chakra, a peculiar worship involving twenty-five forms of Nṛsiṃhas who are in yuganaddha posture with twenty-five forms of Kālī-s is practiced just before the ūrdhvāmnāya krama. This procedure enables the sādhaka to pierce through the Bindu and reach the states leading up to the Mahābindu. This worship invokes the Tirodhāna chakra which is under the control of Bhagavatī Guhyakālī without whose grace, her aspect as Raktā or Kāmakalākālī is near impossible to attain.
The twenty-five mithunas are invoked through their corresponding fifty mantras (one each for twenty-five Nṛsiṃhas and Kālīs) representing the letters of the Sanskrit alphabet.
1 Jvālāmālī Nṛsiṃha and Dhūmakālī
2 Kṣobhaṇa Nṛsiṃha and Ghoranādakālī
3 Aparājita Nṛsiṃha and Jvālākālī
4 Sthiti Nṛsiṃha and Kalpāntakālī
5 Kalpānta Nṛsiṃha and Vetālakālī
6 Ananta Nṛsiṃha and Kaṅkālakālī
7 Parāpara Nṛsiṃha and Durjayakālī
8 Viśvamardana Nṛsiṃha and Samhārakālī
9 Bhadra Nṛsiṃha and Raudrakālī
10 Sahasrabhuja Nṛsiṃha and Kṛtāntakālī
11 Vidyujjihva Nṛsiṃha and Mahārātrikālī
12 Ghoradaṃṣṭra Nṛsiṃha and Saṃgrāmakālī
13 Mahākālāgni Nṛsiṃha and Bhīmakālī
14 Meghanāda Nṛsiṃha and Shavakālī
15 Vikaṭa Nṛsiṃha and Chaṇḍakālī
16 Piṅgasaṭa Nṛsiṃha and Raktakālī
17 Pradīpta Nṛsiṃha and Ghorakālī
18 Viśvarūpa Nṛsiṃha and Sumahattarīkālī
19 Vidyuddaśana Nṛsiṃha and Santrāsakālī
20 Lakṣmī Nṛsiṃha and Kāmakalākālī
21 Vidrāvaṇa Nṛsiṃha and Dakṣiṇākālī
22 Kṛtānta Nṛsiṃha and Bhadrakālī
23 Bhrāmaka Nṛsiṃha and Shmaśānakālī
24 Pratapta Nṛsiṃha and Siddhikālī
25 Sarvatejomaya Nṛsiṃha and Unmattakālī
Late Mahāmahopādhyāya Rājeśvara Mishra of Prayāga had an image of Pratāpa Nṛsiṃha and Siddhikālī mithuna in his worship, which was handed down to him by an upāsaka in Nepal. Mishraji personally mentioned to me that this idol would change position in his pūjāgṛha by itself and that raktacandana would appear on it every night. I was blessed with the opportunity of offering worship to this striking idol.