Rerum Natura
The encyclopedia of ingredients and materials.
Rerum Natura gathers 983 things worth carrying home from an adventure. The alchemical ones come from Michael Ghelfi's house rules. A mandrake root shrieks when it is pulled. The last breath of the dying is caught in a special jar at the moment of death, with no second attempt. The rest are plain materials at D&D prices, like crane meat, once a dish for the kings of France. Every entry says where it is found, its rarity, price and lore, and most say how to harvest it (skill and DC, season, sometimes a special jar). Potions are brewed from the essences of the ingredients, and one button puts an ingredient in a character's inventory on the Crafting Table.
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