Heavy Labor - Best Gifts For Lisa
To begin the quest, find Lisa at the Knights of Favonius headquarters. From there you will head to the souvenir shop. You will need to choose a gift for Lisa. There are a few options to choose from, but the best option is the Old shredded parchment given Lisa's work as a librarian.
Then go to the restaurant next door and meet the waitress named Sara. As before, you will have to choose a dish that Lisa likes. You can talk to Lisa for more information, but the best option is the Vegetarian radish soup.
After leaving the restaurant, your last stop is the flower shop where you will meet a girl named Donna. The best flower for Lisa to choose is the Cecelia. After choosing the final gift, you will hear that the borrowed book has been stolen and you will move on to the next part of the quest.
Lost book
This part of the quest is much simpler than the previous one. Use the elemental sight ability (detective vision) to find the purple elemental energy marks on the ground nearby. These marks form a trail that will lead you to your goal. They'll take you out of Monstadt and into the wild, eventually leading you to a secret entrance to a dungeon called the Fortress of the Abyssal Mages.
There is a boss fight with the Abyss Mage Emery at the end of the dungeon, but it's nothing you can't handle. The boss is based on Cryo, so use Amber's Pyro attacks or Lisa's Electro attacks to speed up the fight. After defeating the boss, open the treasure chest in the newly opened room and exit the dungeon. Return to Lisa in the Monstadt Library and remove Teyvat's Travel Guide from the nearby library to complete the quest.
