Nippur City is the domain of Enlil, the Lord of Spirit and Air. They call him "Great Mountain," "Lord of Destiny," "Lord of Prosperity," and view him as the most powerful among the Babylonian Pantheon of Gods.
From these small details, one can see that although Marduk has mastered the Origin Divine Authority, the Three Pillar Gods under his reign have not entirely yielded their loyalty.
Besides this, the cities of Kuza, which worship the God of the Underworld Ereshkigal, Uruk, which worships the Moon Goddess Sin, and Kish and Susa, which worship the Sun God Utu, have also developed well.
To enhance the prestige and status of their own City Guardian Gods, these city-states in the Two River Basin often engaged in conflicts, with the fervor not less than Greece's Trojan War in its day.
With fear, bloodshed, and sacrifices distinguishing you, us, and them, faith becomes more resolute.
Thus, the Babylonian gods were pleased to see this happen.