Goblin Weapon Oil

Attacks made with a Goblin-made weapon (it has no effect on non-Goblin weapons) coated by this oil deal +5 Damage as Acid.

Oil takes one round to apply to a weapon. Once applied, the effect lasts for the entire combat.

A polymorphed character can only benefit from a weapon oil if the oil was applied to their weapon prior to transformation. Monks cannot apply a weapon oil to their bare hands but can apply a weapon oil to a physical weapon they wield.

A single weapon may be coated with more than one oil at a time, but unless otherwise specified, each oil takes one round to apply. Multiple coatings of the same oil do not increase that oil’s effectiveness.