Bough Keeper: Dainsleif

Ask Lawrence about the stranger: First up, head out the front gates of Mondstadt and find Lawrence, the guard. He'll point you towards Wagner, the Smithy, saying he saw the stranger talking to him.

Ask Wagner about the stranger: Wagner's just a short walk northwest from Lawrence. After a quick chat, he'll let you know the stranger's usually found at the Angel's Share Tavern.

Ask Charles about the stranger: Follow the path northeast to the tavern. Head inside and talk to Charles, the bartender. He'll tell you the stranger visits nightly and suggests you wait upstairs for him.

Go to the second floor of the tavern and wait on the seat by the railing: Head up to the second floor of the Angel's Share. Find the table and chairs by the railing and take a seat. You'll trigger a short scene.

Go to the first floor of the tavern and find the stranger: After the scene, hop over the railing back down to the first floor. Dainsleif will be sitting alone in the southeast corner. Go chat with him.

Go to the Temple of the Falcon: Teleport to the Temple of the Falcon. Dainsleif will be waiting at the bottom of the stairs. Talk to him, and he'll mention seeing Abyss Order marks and ask you to head inside.

Enter the Temple of the Falcon: Interact with the door to enter a temporary Domain called 'Abyssal Traces'. Make sure you've got a Cryo character in your party – they'll be super helpful here!

Continue exploring: Inside the Domain, interact with the contraption by the door to open it. In the next room, you'll see a Hilichurl digging by a wall. Defeat it, then break the wall to find an Exquisite Chest. Grab the loot and move on.

Continue exploring (cont.): When you reach the 'door of resurrection', drop down into the room below. You'll find a contraption in the center and three Hilichurl Shooters (Cryo, Electro, Pyro). Take them out, and more enemies will spawn: a Blazing Axe Mitachurl and two Hilichurl Fighters. Once they're down, use the contraption to open the next door. Don't forget the Common Chest on your way out!

Continue exploring (cont.): This next room is a bit tougher. You'll face a Pyro Abyss Mage, a Pyro Hilichurl Shooter, and four Hilichurl Fighters. Notice the Hydro stones and a Pyro node in the center. The Pyro node buffs the Fighters' clubs and makes them stronger against Pyro. Your best bet is to hit the Hydro stones to create a rain effect, then switch to Cryo or Electro to trigger reactions like Superconduct and Electro-Charged. After defeating them, open the Common Chest to the west and use the Anemo updraft to reach the platform with another 'door of resurrection' to the east. Continue east and you'll encounter a Hydro Abyss Mage and a Pyro Abyss Mage. The Hydro Mage's shield is weak to Cryo, and the Pyro Mage's shield is weak to Hydro (though Cryo works too). Use a mix of Hydro, Cryo, and Electro to take them down.

Talk to Dainsleif: After the fight, you'll get a scene with Dainsleif. He'll mention the 'Herald' has already left, and you should head to Wolvendom. Before you leave the Domain, make sure to open the Precious Chest.

Go to Wolvendom: Teleport to the Dawn Winery waypoint and head north/northeast towards Andrius's boss arena. Dainsleif will be waiting by a lit torch. Talk to him for another scene.

Look for clues related to the Abyss Order in Wolvendom (0/2): Dainsleif will explain that the torches have an Abyssal spell on them, visible as purple writing. He'll ask you to find more clues about the Abyss Herald. There are two spots to check: one north and one east. Head east first. As you approach the torch, enemies will spawn: a Pyro Abyss Mage, a Blazing Axe Mitachurl, and two Wooden Shield Hilichurl Guards. Use Hydro combined with Cryo or Electro to make this fight easier. After defeating them, interact with the torch.