Refinement Jar

Wondrous Item, Uncommon — Requires Attunement

This alchemist’s jar is covered in delicate engravings depicting snakes, poisonous plants, and alchemical symbols. Its interior is divided into several invisible compartments that distill, filter, and concentrate any substance poured into it.

Poison Production. Once per day, the jar can produce one dose of Basic Poison.

Refinement. You can pour one dose of poison into the jar and spend 2 hours refining it. At the end of the process, the poison’s saving throw DC is replaced by:

DC = 8 + your Intelligence modifier

If you have Proficiency in Nature, also add your Proficiency Bonus to the DC.

If you have Expertise in Nature, add twice your Proficiency Bonus instead.

The poison retains all its other properties, including its method of application, duration, damage, additional effects, and number of uses.

Alchemical Alteration. When you refine a poison, you can attempt to alter the nature of its damage. Make a DC 15 Intelligence (Nature) check. On a success, you can replace the poison’s Poison damage with one of the following damage types: Acid, Necrotic, or Psychic.

On a failed check, the poison is still refined normally, but its damage type remains unchanged.