Throw the indicated Darkdeath item into the spring that randomly appears inside the dungeon. Note: The spring often appears at Mid-Tier Hero Mastery Cave. You can only use one spring for each piece of equipment, however there is a chance that the item will not be returned.

G-Darkdeath Body: Throw Darkdeath Body into a spring.
G-Darkdeath Head: Throw Darkdeath Head into a spring.
G-Darkdeath Left Arm: Throw Darkdeath Left Arm into a spring.
G-Darkdeath Leg: Throw Darkdeath Leg into a spring.
G-Darkdeath Right Arm: Throw Darkdeath Right Arm into a spring.