Alchemy

 Alchemy is the Proficiency specialization of Harpies. It grants them a 10% chance to produce twice the amount of resources when working in the following buildings:

•  Alchemist's Hut
•  Apothecary
•  Blight Post
•  Druid's Hut
•  Flawless Druid's Hut
•  Herbalists' Camp
•  Small Herbalists' Camp
•  Teahouse
•  Tinctury