Pale Oil is an extremely important item in Hollow Knight: Silksong as it's used to upgrade your needle. After you complete the "The Threadspun Town" quest, you'll meet Pinmaster Plinney in Bellhart.

There are three Pale Oil items in Pharloom — Pale Oil is used at the Pinmaster. It polishes Hornet’s sword and makes it more powerful. The Pinmaster is unlocked by completing wishboard requests at ...

Pale Oil is a rare Key Item in Hollow Knight Silksong that allows you to upgrade Hornet's needle weapon to deal increased damage. There are only a few instances of it in the game spread out across ...