Mending Rune of the Death-Prince is a Key in Elden Ring.
Rune gestated by Fia, the Deathbed Companion.
Used to restore the fractured Elden Ring when brandished by the Elden Lord.
Formed of the two hallowbrand half-wheels combined, it will embed the principle of life within Death into Order.
The Golden Order was created by confining Destined Death. Thus, this new Order will be one of Death restored.
Elden Ring in-game description
Mending Rune of the Death-Prince Location

Additional Insights Into Mending Rune of the Death-Prince
- Effect: Can be used to mend the shattered Elden Ring
- Rarity: Legendary
- Sell Value: 0 Runes
- Mending Rune of the Death-Prince can be traded.
- On-Hand Capacity: 1
- Storage Capacity: 1