Lantern Oil

Lantern oil, formerly known as lamp oil, is a substance used as fuel for the lantern in certain games of the Legend of Zelda franchise.

Link: The Faces of Evil / Zelda: The Wand of Gamelon
Lamp Oil makes its debut in both Link: The Faces of Evil and Zelda: The Wand of Gamelon, where three refills can be bought from the respective shopkeeper for five Rubies. Link and Zelda can hold up to 99 units of Lamp Oil. It is used to light the lantern in dark places, as well as relight it when it goes out. Both games have a lantern upgrade that does not need Lamp Oil to function, rendering further purchases of it unnecessary when obtained.

The Legend of Zelda: Twilight Princess
The lantern oil can be used to fuel the lantern in The Legend of Zelda: Twilight Princess, allowing Link to navigate dark areas. He can store lantern oil in either a bottle or pour it into the lantern and stow it away. If Link is equipped with the lantern, it slowly uses up the lantern oil.

In most cases, Link can obtain lantern oil by purchasing refills at shops, including Sera's Sundries, the Goron Shop, Trill's Shop, and the Oocca Shop for 20 Rupees. During the night, it is also sold at the Goron Shop of Kakariko Village for the same price. At first, Coro offers Link a bottle of oil for 100 Rupees, and he subsequently offers refills for 20 Rupees, allowing Link to choose either his lantern or an empty bottle if he has one. In Hyrule Castle Town, there is a young Goron selling lantern oil at a slightly higher price of 30 Rupees. Unlike other shops, the Goron only refills bottles but and not the lantern itself.

Lantern oil is most often required for subterranean areas, such as caves, but are also used in some dungeons, such as Arbiter's Grounds, which has large tubs filled with lantern oil. Additionally, yellow Chu Jelly acts as a substitute for lantern oil.