Toxicologist (Dexterity)

You've become an expert on the field of poison and venom, granting you the following benefits:

• Increase your Dexterity, Intelligence, or Wisdom score by 1, to a maximum of 20.
• When you deal poison damage, you can change the damage type to necrotic instead.
• During a long rest while you have a poisoner's kit, you can create a single potent poison at no cost. Unlike the others granted by poisoner, this expires after 24 hours.
• When you force a creature to make a saving throw against poison damage (including poison converted to necrotic damage by this feat), the DC is equal to 8 + your proficiency bonus + the modifier of the ability increases by this feat, unless it would be higher.