The quest is unlocked after completing the Each Step Like Thunder scenario.
"The Blacksmith Guild believes that there are more weapon-derusting secrets to be learned from Rock Octoroks, and that studying them in their habitat could lead to a better method. Find out."
"After you brought back materials from Rock Octorok habitats, the guild improve its derusting method even more. Now you can revive rusty weapons even better!"
- Increased Strength of De-rusted Weapons
|Hylian Blacksmith Guild|
|Military Training Camp|
|Kochi Dye Shop|