Dugby gives the Side Quest "Death Mountain's Secret", in which he challenges Link to find the treasure that he buried near the Bridge of Eldin, with the promise that Link can keep it if he finds it. However, because Dugby's mouth is submerged underwater when spoken to, his directions to the treasure come out as gurgles. If visited during the night, Dugby mutters in his sleep clearer directions to the treasure. The treasure turns out to be a Drillshaft. Although amazed that Link found the treasure, Dugby is skeptic about it and checks the Weapon to determine if it is the same Drillshaft he buried, and confirms that it is the same one. True to his word, he lets Link keep the Drillshaft as a reward for finding it.
- "The treasure that young Goron Dugby hid and alluded to turned out to be...a drillshaft! Since you found it, he's going to let you keep it." — "Death Mountain's Secret" (Breath of the Wild)
- "I'm challengin' my gramps again to see who can soak in the hot spring the longest!" — Dugby (Breath of the Wild)
- "I bid a tweshure binteen gear an ba Bridge of Eldin! Iz an abazing schtick! Beely bool! If boo bind it... iz boars!" — Dugby (Breath of the Wild)
- "Bello! Goo gon't go but I'm thaying?" — Dugby (Breath of the Wild)
- "*snore* The treasure...at the top of a lava waterfall..." — Dugby (Breath of the Wild)
- "Hey! Don't tell me that stick is... [...] That's the drillshaft I hid! ...Right? Actually, I need to get a better look at it. Show it me! NOW!" — Dugby (Breath of the Wild)
- "Oh! I guess so. It's suspicious though! I can't help thinkin' that's the drillshaft I hid... There's no mistakin' it... There was definitely a big noise... Could this person be... Mmhmmm... So you went and found the drillshaft I hid." — Dugby (Breath of the Wild)