Potion of oil

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! Pink potion.png
Name oil
Appearance random
Base price 250 zm
Weight 20
Monster use Will not be used by monsters.

The potion of oil is the only potion that can be lit for an extended period of time.

Quaffing this potion is not useful and in fact abuses your wisdom ("That was smooth!" or, if cursed, "This tastes like castor oil.") If the potion is lit and you like fire, quaffing it will instead exercise wisdom ("Ahh, a refreshing drink."). It has other uses, however. One use is to untrap a squeaky board, similar to a can of grease.

Some uses involve lighting the oil by applying the potion. A lit potion of oil can be thrown at an enemy to explode for 4d4 fire damage or thrown up to cause fire damage to yourself, removing slime; no damage is incurred if unlit. A lit potion of oil is dangerous when quaffed - it deals 3d4 fire damage and abuses wisdom unless you are polymorphed into a monster that likes fire (note: this is not the same as intrinsic fire resistance, although that will reduce the damage taken to 1d4). Monsters that like fire include fire vortices, flaming spheres, salamanders, and fire elementals. A lit potion of oil can be snuffed by applying it again.

Oil can also be used to fix damaged weapons. By dipping a rusty or corroded weapon into a non-cursed potion of oil, it loses one measure of erosion damage. To completely repair a thoroughly corroded weapon, you thus need three potions of oil: from thoroughly corroded to very corroded to corroded to uncorroded. Oil does not repair rotten or burnt weapons, nor does it repair damaged armor. Dip testing with a unicorn horn identifies and wastes the potion, and gives a purely cosmetic message about the horn becoming oily ("Your unicorn horn gleams with an oily sheen."). Dipping into a lit potion of oil will burn the dipped item (if appropriate), using up the potion whether the item was burned or not. This can be used to identify scrolls of fire and spellbooks of fireball (which won't burn up, unlike other scrolls and spellbooks) or formally identify fireproofing. It is a relatively wasteful way to do either, though, since the potion will disappear and items which are not fireproof will be damaged or destroyed.

A potion of oil can be used to refill an empty oil lamp, by #dipping the lamp in the potion. However, if you attempt to do this while either the lamp or potion is lit, the potion will be wasted. (If the lamp is lit and the potion is not, the potion will explode!) Magic lamps behave just like oil lamps in this respect, so you can't identify them with oil.

Attempts to use a cursed potion of oil can cause the oil to spill over your fingers, making them too slippery to hold a weapon. If this happens in a shop, the shopkeeper will consider your weapon his newfound property. This is another reason not to apply potions in shops. Applying a towel cleans your hands and removes this effect.

Identification

Identifying a potion of oil is easy: just try to apply every new potion you find. If the potion lights, it's oil, and autoidentifies. Do not do this when the potion is owned by a shop, or you will be forced to pay for the potion and will be charged Yendorian Fuel Tax.

In previous versions of NetHack, it was possible to indirectly identify the potion without actually applying it (and therefore avoiding payment in shops) by dropping everything else that could be applied, then hitting a. If the potion was a potion of oil, the player was asked what they wanted to apply; otherwise they would be told they have nothing that can be applied. This is no longer true since NetHack 3.6.0, which now always shows the applying prompt as long as the player has at least one potion in their inventory, regardless of whether it can be applied or not.

If you start the game with an oil lamp, the potion of oil is already identified for you.

This page may need to be updated for NetHack 3.6.0.

It may contain text specific to NetHack 3.4.3. Information on this page may be out of date.

Editors: After reviewing this page and making necessary edits, please change the {{nethack-343}} tag to {{nethack-360}} or {{noversion}} as appropriate.