Amun could not let Ra's misdeeds go unpunished. He knew everything about the other god, including his strengths, unyielding personality, and unstoppable greed. After living for so long as one half of the same being, Amun felt it was his duty to rectify the injustices of his former partner. Even if it meant his death, Amun would not concede.
Amun (also Amon (/ˈɑːmən/), Amen; Ancient Greek: Ἄμμων Ámmōn, Ἅμμων Hámmōn) was a local deity of Thebes. He was attested since the Old Kingdom together with his spouse Amaunet. With the 11th dynasty (c. 21st century BC), he rose to the position of patron deity of Thebes by replacing Monthu.
After the rebellion of Thebes against the Hyksos and with the rule of Ahmose I, Amun acquired national importance, expressed in his fusion with the Sun god, Ra, as Amun-Ra.
Amun-Ra retained chief importance in the Egyptian pantheon throughout the New Kingdom (with the exception of the "Atenist heresy" under Akhenaten). Amun-Ra in this period (16th to 11th centuries BC) held the position of transcendental, self-created creator deity "par excellence", he was the champion of the poor or troubled and central to personal piety. His position as King of Gods developed to the point of virtual monotheism where other gods became manifestations of him. With Osiris, Amun-Ra is the most widely recorded of the Egyptian gods. As the chief deity of the Egyptian Empire, Amun-Ra also came to be worshipped outside of Egypt, in Ancient Libya and Nubia, and as Zeus Ammon came to be identified with Zeus in Ancient Greece.