Way to unlock: Automatically, during the Haven's Best and Brightest side quest.
The quest-giver: Apothecary (M2,5)
This quest becomes available after you see the Apothecary in the South-Western part of Haven (M2,5). Talk to the apothecary about brewing and upgrading potions, and about equipping your party members with them. Apart from that, you can offer to help, which unlocks this quest. The apothecary asks you to find master Taigen's notes and you need to reach the cottage to the North of the village (M2,5a). Enter the cottage and start tapping the scanning key/button. Thanks to this, you will locate the notes on the table. You can now return to the Apothecary and hand the documents over.
Rewards for completing the quest:
- Experience (few)
- Recipe: Lyrium Potion Recipe