If you want to explore the apothecary's cellar in Baldur's Gate 3, there are a couple of puzzles you'll have to overcome. The first is heading to the Blighted Village, finding the cellar hatch, and then uncovering the secret door that leads you further into the underground area. The second is convincing a magical mirror that you're a friend of its master so it'll grant you access to his lab.
The lab itself contains some pretty decent loot, including lots of magical scrolls, and the powerful Necromancy of Thay book. This magical tome can give you a permanent bonus to Wisdom checks—if you're able to overcome the trial of reading it, that is. Here, I'll explain how to open the secret door in the Blighted Village cellar and what answers you need to give to the mirror to get into the lab.
