Asura · Smarta · South India · Uchchangi Durga to Airani, Karnataka
Guhasura
The demon of the Harihar charter, who ruled the country between Uchchangi Durga and Airani and won from Brahma the boon that neither Vishnu nor Shiva could kill him alone; the two merged as Harihara to end him at the Tungabhadra–Haridra confluence.
Sources: Harihareshwara Temple (Harihar, Karnataka) — Wikipedia · see Guhasura's web