Just as Identify can determine the properties of an object, Diagnosis determines properties affecting a living organism. Diagnosis gives off information about the target that is then interpreted by a particular skill check. If more than a minute is spent concentrating on keeping the spell going, the skill check is made with advantage so long as the caster was trained in that particular skill.
To determine problems affecting a target's health, a Medicine check. To determine details of a particular curse or enchantment, an Arcane Knowledge check. For some indication of a natural poison or infection, Medicine or Nature checks would be best. If a manufactured poison is used, a World Knowledge check might be used. The higher the skill level, the more detail the spell will give.
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