Weapon poison++

Weapon Poison++ is made by mixing cave nightshade and poison ivy berries in a vial of coconut milk, giving 190 Herblore experience. It requires level 82 Herblore. Applying a weapon poison++ will give you a chance to poison your opponent in combat. The poison effect lasts for 10 minutes and deals between 20% to 38% of your ability damage per hit.

Production costs
This table is based on the Grand Exchange prices of a vial of coconut milk, poison ivy berries and Belladona seed (cave nightshade cannot be traded on the Grand Exchange, it can only be Farmed or gathered in the Skavid caves). It is accurate assuming the two items are bought from the Grand Exchange and the Weapon poison++ is sold afterwards.