Effects: A blade coated with this substance inflicts increased damage on ornithosaurs.

Preparation: The oil is made by mixing ingredients providing one measure each of vitriol, quebrith, rebis and hydragenum; high-quality grease must be used as a base.

Duration: Long

This oil, sometimes called Basilisk Bane, contains a poison that is deadly to all reptiles. Even the basilisk, which possesses its own venom and is resistant to poisons, cannot withstand a blade coated with this substance.