Why did Zeus reward Styx with honor from gods during oaths?

Zeus rewarded Styx with honor among the gods during oaths because she played a crucial role in the battle against the Titans. Styx, the personification of the river that souls must cross to reach the afterlife, was a significant ally to Zeus during his conflict with the Titans. Her loyalty and support were instrumental in establishing his authority and power among the gods following his victory. As a result, Styx was granted a prominent place in the hierarchy of divine beings, with her name invoked in solemn oaths, reinforcing the seriousness and sanctity of such promises. This demonstrates the connection between loyalty in battle and the subsequent honor bestowed upon deities in Greek mythology.