Something's Rotten in Faerun
Oil of Impact
This oil has beneficial effects on blunt weapons and missiles, both magical and nonmagical. When applied to a blunt weapon such as a club, hammer, or mace, it bestows a + 3 bonus to attack rolls and a +6 bonus to damage. The effect lasts 1d4 + 8 rounds per application. One application will treat one weapon.
When applied to a blunt missile, such as a hurled hammer, hurled club, sling stone, or bullet, it bestows a + 3 bonus to attack rolls and a + 3 bonus to damage. The effect last until the missile is used once. One application will treat 4-5 sling stones or two larger weapons. A flask of oil of impact holds 1d3+2 applications.