Assumed to have been made by the fabled Stone Giants who inhabited the Kleftmon mountain range in Korbantir Ages ago, Swykr Oil is a very rare find indeed. Stored in vessels disguised as plain rocks, the oil may be applied to any weapon (magical or otherwise) and grants a +1 bonus on attack and damage by reducing the resistance at which the weapon is wielded.
The substance is non-magical, but rather a concoction of unknown ingredients, so it may be applied to a magical weapon to provide an additional bonus.
The oil may be applied before an attack as a free action. Once the weapon hits, the oil is expended from the weapon and will need to be re-applied.
There are 30 uses per container. The substance cannot be refilled.