Amogha is one of the names of God Viṣṇu (Vishnu), as described in Viṣṇusahasranamastotra (Vishnusahasranama; Hymn of the Thousand Names of Vishnu).

Mahābhārata (Kinjawadekar)(13.149.25,30)
Mahābhārata Vols. 1-43 (Siddhāntabāgīśa)(13.127.25,30)