Given their insidious and deadly Nature, poisons are illegal in most societies but are a favorite tool among assassins, drow, and other evil creatures.
Poisons come in the following four types:
Contact Contact poison can be smeared on an object and remains potent until it is Touched or washed off. A creature that touches contact poison with exposed skin suffers its Effects.
Ingested A creature must swallow an entire dose of ingested poison to suffer its Effects. The dose can be delivered in food or a liquid. You may decide that a partial dose has a reduced Effect, such as allowing advantage on the saving throw or dealing only half damage on a failed save.
Inhaled These poisons are powders or gases that take Effect when inhaled. Blowing the powder or releasing the gas subjects creatures in a 5-foot cube to its Effect. The resulting cloud dissipates immediately afterward. Holding one’s breath is ineffective against inhaled poisons, as they affect nasal membranes, tear ducts, and other parts of the body.
Injury Injury poison can be applied to Weapons, Ammunition, trap Components, and other Objects that deal piercing or slashing damage and remains potent until delivered through a wound or washed off. A creature that takes piercing or slashing damage from an object coated with the poison is exposed to its Effects.
General rules for poisons:
Uses The amount of uses a vial of poison has is one, or one dose.
Applying Applying a poison requires an action.
Duration The poison lasts for one minute on the weapon before it dries out, or loses its chemical potency.
Charges After a successful hit or save attempt, the poison is used, or there is only one charge to the poisoned item.