The Tyrant of the Sand Sea
The quest is unlocked after completing The Future of Hyrule scenario.
"A rampaging Molduga has been sighted in the desert near Gerudo Town. Acquire proof of its defeat to put the town residents' minds at ease."
"The Gerudo were relieved to see evidence that the Molduga had been defeated. Urbosa vowed that no matter how terrible the foe, she would always keep her people safe."
- Urbosa: Enhanced Ability