Here's a guide for "Knights of Favonius", which concludes Prologue: Act I - The Outlander Who Caught the Wind in Genshin Impact.
Image via HoYoverse.
Unlocking the Quest 
1.Prerequisites: You need to have completed the previous quests in the Prologue, particularly after dealing with the immediate threats like the "Dragon Storm" quest involving Stormterror.
Quest Walkthrough
2.Return to Mondstadt: After resolving or pacifying the situation with Stormterror temporarily, you'll likely return to Mondstadt. This might be automatically triggered as part of the quest progression.
3.Meeting with Jean: Head to the Knights of Favonius Headquarters in Mondstadt. Here, you'll meet with Jean, the Acting Grand Master. She might officially thank you for your help or discuss the ongoing issues with Stormterror.
4.Receiving Recognition: Jean could officially recognize your efforts, which might involve a small ceremony or at least a formal conversation where she discusses the next steps or your role in helping Mondstadt further.
5.Exploring Your New Role or Next Steps: You might be given a task or a tour around the headquarters, introducing you to other key characters if you haven't met them yet, like Kaeya, Lisa, or Amber again for more in-depth interactions or side quests.
6.Setting Up for Future Quests: This part of the quest sets the stage for future adventures. You might receive hints or direct objectives related to finding The Seven Archons or dealing with other regional issues.
7.Quest Completion: The quest likely ends with a dialogue where you're given freedom to explore Teyvat, with Jean or another key figure encouraging you to seek out more about your sibling or the mysteries of the world.
Quest Rewards
•Adventure EXP: A significant amount to help with rank progression.
•Primogems: For completing this part of the storyline, aiding in future wishes.
•Character EXP Materials: Useful for leveling up your characters further.
•Mora: For general expenses and upgrades.
Quest Tips 
•Character Preparation: Although this quest might not involve combat, having a diverse team ready can help with any unexpected challenges or for the quests that follow.
•Engage with NPCs: This is a good chance to interact with various Knights of Favonius members and other Mondstadt citizens for lore, future side quests, or daily commissions.
•Check Your Mail/Inventory: Sometimes, rewards or new items like gadgets or tools are given at the end of such quests, which might not be immediately noticeable.
•Prepare for Archon Quests: After this, you'll likely start moving towards Prologue: Act II - For a Tomorrow Without Tears, so it might be wise to prepare your team for new challenges in Liyue.
If there's an actual quest named "Knights of Favonius" introduced in an update, or if you're referring to a specific part within this act by another name, checking in-game for the exact quest details or looking at the latest Genshin Impact updates or community guides would give the most current information.
