The first upgrade to the Nail requires no Pale Ore, the second requires one, the third requires two, and the final upgrade requires three Pale Ore, for a total of six.
There are six pieces of Pale Ore to be found in total:
|Source||Conditions / Requirements||Map|
|Found in Ancient Basin, west of the tram station and the main Ancient Basin entrance.||Defeat two Lesser Mawleks that guard it.|
|Given by the Seer.||Collect 300 Essence with the Dream Nail.|
|Found in Hallownest's Crown at the very top of Crystal Peak, embedded in the pedestal of a statue of the Radiance.||Requires Mantis Claw.|
|Found in Nosk's lair in Deepnest, accessed by breaking a wall in the room just west of the Hot Spring.||Requires defeating Nosk.|
|Given by Grubfather.||Rescue 31 Grubs.|
|Reward in Colosseum of Fools.||Complete the Trial of the Conqueror.|
- Pale Ore has some connection to Pale Beings; the two seen in the game being the Pale King and the White Lady.