A Strike to Pierce Stone
The quest is unlocked after completing The Future of Hyrule scenario.
"The mark of true spear expertise is the ability to take down a Molduga. Link must prove to the spear instructor that he has what it takes to beat this fearsome foe."
"Well, well, well! Defeating a Molduga is no easy feat! The spear instructor was so impressed by Link's accomplishment that he displayed proof of the victory at the training ground for all to see."
- Spear: Enhanced Ability