Ashe's Gourd of Oil

This gourd of oil has 3 uses. These uses can only be regained if the gourd is refilled. The oil that this gourd holds is highly flammable. As an action, you can attempt to pour 1/3 of the oil on a creature within 5 feet of you, treating the oil as a melee weapon. The targeted creature must succeed on a DC 13 Dex save or be coated in oil for the next 5 rounds. During this time, If the creature is hit with an attack that deals fire damage, it takes 1d4 + 2 extra fire damage from the burning oil. If you pour 1/3 of the oil into a glass container, you can throw that glass container, treating it as an improvised weapon (Range 20/60). On a hit, the target takes 1 piercing damage and is covered in oil for 3 rounds. If the creature washes off the oil by any means within 5 rounds, using its action, the effect ends.