Heliana's Guide to Monster Hunting, pg. 220
You have a knack for retrieving exceptional components from the gnarliest of corpses.
• Increase your Dexterity or Intelligence by 1, to a maximum of 20.
• When you make a Harvesting check using a skill with which you are proficient, your proficiency bonus is doubled.
• When you attempt to harvest a creature for which you don’t have the required skill proficiency, you can add your proficiency bonus to the result of the roll.
• If you are helping with a Harvesting check, you add your full proficiency bonus to the check’s result, regardless of whether you’re proficient in the requisite skill.
• You do not suffer disadvantage on your Harvesting checks as a result of choosing to perform both the Assessment and Carving checks alone.