Oil

Plain oil. When the jar breaks, the oil covers everything nearby. Enemies covered in oil are more vulnerable to the Burn status abnormality.

When thrown at enemies, it breaks upon impact, covering them in oil and making them more vulnerable to Burning. Up to ten can be carried. Can be sold for 5 5.

Locations
Two sold by Dungeon Memorial Mob for 50 50 each.
Ashina Outskirts From the Outskirts Wall - Stairway Sculptor's Idol, turn into the stairway's opposite direction and drop onto the ledge behind the Rooster. Grapple onto the small platform below to reach the two Balloons. Ashina Castle To the left from before the stairway leading to the castle, open two sets of gates. The item is by a tree in the grass. Towards the Great Serpent Shrine from the Old Grave Sculptor's Idol. Abandoned Dungeon Found in the poison pools where Snake Eyes Shirahagi is fought. Senpou Temple On the path to the left where the Monks patrol after the first gatehouse. Fountainhead Palace Two behind the Flower Viewing Stage under a waterfall. Hirata Estate On a boat near the first pond with the Pot Noble in Hirata Estate. In the area with Shinobi Hunter Enshin of Misen in Hirata Estate.

Locations
Given by Anayama the Peddler if Wolf purchases the Flame Barrel Memo while already having the Flame Barrel.
Reward for defeating common human enemies, including Senpou Monks.
Ashina Castle (First Invasion) Before the Chained Ogre in the bottom of the Upper Tower, on the stairs. (First Invasion) On the stairs leading up to the Castle. (First Invasion) Before going up the stairs to the castle, on the right in a courtyard beneath a tree. Abandoned Dungeon In the pit with Crickets. Ashina Depths In the poison pools atop a ledge where Snake Eyes Shirahagi is fought. Near the house by a stone lantern in Hidden Forest. Hirata Estate By the Bandits up on the Bamboo Thicket Slope. By a wall after climbing out of the well. Left from entering the Main Hall after defeating Juzou the Drunkard, by the secret door.