Detect Poison Feat

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Detect Poison represents trained, nonmagical expertise in recognising the telltale signs of poison on weapons, objects, food and drink. It is the knowledge of the court taster, apothecary, investigator, caravan guard and experienced traveller who knows that a stain, residue, smell, discolouration or unnatural surface sheen can mean death.

What Detect Poison Actually Does

Detect Poison is investigation rather than immunity. The feat helps a character recognise that something is dangerous before exposure occurs.

Depending on the substance and circumstances, warning signs might include unusual sediment, an oily film, crystalline residue, staining around a stopper, altered colour, a bitter or metallic smell, damage to organic material, abnormal corrosion, disturbed wax seals or traces left where a weapon was coated.

Characters should not be encouraged to taste unknown substances as a routine detection method. Examination is useful precisely because poison can be dangerous before its identity is known.

Detection Is Not Identification

Finding evidence of poison answers the immediate question: is this likely to be poisoned?

It does not automatically answer:

• What exact poison is it?
• How strong is the dose?
• How quickly will it act?
• What saving throw does it require?
• What antidote will work?
• Has somebody already been exposed?

Those questions belong to alchemical expertise, medical knowledge, specialist tools, further investigation or magic.

Detect Poison Feat vs Detect Poison Spell

The feat and the Detect Poison spell solve similar problems in very different ways.

The feat is mundane expertise. It requires close examination and depends upon evidence that a trained person could physically recognise.

The spell uses divination magic and can reveal poison without relying upon ordinary sensory clues.

That distinction keeps both options useful. A professional poison examiner can work repeatedly without expending magic, while a spellcaster can investigate cases where mundane evidence is absent, destroyed or deliberately concealed.

Examples in Play

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Detect Poison in 1454

In the campaign present, poison detection belongs to practical professions rather than modern laboratories.

Apothecaries, physicians, herbalists, court servants, military quartermasters, hunters, professional tasters and investigators all have reasons to learn what contamination looks like.

The feat is especially valuable where food, drink and medicine pass through several hands before reaching an important person.

A prince’s household may employ servants specifically to watch kitchens and cellars. A merchant caravan may inspect suspicious water or provisions after travelling through hostile territory. An apothecary may be asked whether a patient’s medicine was altered after leaving the shop.

Adventurers encounter the same danger on a less orderly scale: poisoned locks, trapped containers, tainted wells, coated blades, contaminated provisions and gifts sent by people who expect hospitality to do the killing for them.

Useful Specialists

• Court tasters — trained to inspect food, cups, serving vessels and preparation practices.
• Apothecaries — recognise herbs, residues, preparations and suspicious combinations.
• Caravan guards — inspect water, provisions and weapons after sabotage or theft.
• Investigators — look for evidence that an apparent illness or sudden death began with deliberate contamination.
• Hunters and herbalists — recognise dangerous plants, venoms and natural toxins encountered outside cities.

Optional Variable-DC Rule

An earlier version of the feat associated with Eric D. Harry’s Netbook of Feats used a difficulty tied more closely to the poison itself rather than the fixed DC 20 preserved by the later page.

A GM who wants poison detection difficulty to scale by substance may therefore replace the fixed DC with the poison’s own save DC, or use that value as a starting point before adjusting for concealment and available evidence.

This is an optional historical variant. It does not replace the default D&D 3.5e rule on this page.

Related Rules and Equipment

Detect Poison Feat FAQ