Effects: A blade coated with this substance inflicts increased damage on all insectoid creatures.

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

Duration: Long

Huge viys, kikimores and other insectoids suffer greater damage from weapons coated in this poison invented by witchers. Witchers also use Insectoid Oil to rid their fortresses of bugs and parasites.