The drought goddess who helped the Yellow Emperor defeat Chi You is Hanba.
Hanba, also written Nüba or simply Ba, is a Chinese drought deity associated with intense heat and the drying of water. In the battle at Zhuolu, the Yellow Emperor Huangdi faced Chi You, whose forces employed the wind deity Feng Bo and the rain deity Yu Shi. Hanba descended from heaven and used her drought power to counter their storms, helping Huangdi win.
The name Hanba combines han, meaning “drought,” with ba, her personal name; nü means “female” or “woman.” This explains why sources may present the answer as Hanba, Nüba, or Ba. The figure is described both as a goddess and as a drought demon, reflecting changing interpretations in Chinese mythology.
After aiding Huangdi, Hanba reportedly could not return to heaven. She wandered into northern regions, and drought followed wherever she appeared. She is therefore both a heroic ally in the Zhuolu battle and a feared explanation for destructive dry weather.