Detect Poison & Disease

{e}{t}, A yew leaf: You can sense the
presence and location of poisons, poisonous creatures, and diseases within 30 feet of
you. You also identify the kind of poison, poisonous creature, or disease.
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The spell is blocked by 1 foot of stone, 1 inch
of common metal, a thin sheet of lead, or
3 feet of wood or dirt.