Oils can be applied to a witcher’s steel or silver blade to grant a temporary bonus. Typically, oils either increase critical effects or increase damage dealt against a specific type of enemy while the effect lasts. You can oil your blade from the inventory menu, so you can apply a bonus during the middle of a fight if you suddenly decide you need it. Oils can be prepared from alchemical formulas if the right substances are on hand. This is by far the most economical way to create and use them.
| Oils | Effect 1 | Duration | Orens | Weight |
|---|---|---|---|---|
| Arachnid Oil | Poison +30% | 5 | 6 | 0.2 |
| Brown Oil | Bleeding +30% | 5 | 6 | 0.2 |
| Falka's Blood | Damage +10% | 3 | 6 | 0.2 |
| Hanged Man's Venom | Damage dealt to humans +20% | 5 | 6 | 0.2 |
| Insectoid Oil | Damage dealt to insectoids +20% | 5 | 6 | 0.2 |
| Necrophage Oil | Damage dealt to necrophages +20% | 5 | 6 | 0.2 |
| Specter Oil | Damage dealt to wraiths +20% | 5 | 6 | 0.2 |
| Whetstone | Damage +20% | 20 | 51 | 1 |
| Whirl | Damage +5% | 5 | 6 | 0.2 |