Here's a detailed walkthrough for "Light Guiding Ceremony", which is indeed part of Prologue: Act III - Song of the Dragon and Freedom in Genshin Impact. Remember, this guide reflects the general gameplay as of this writing. If there have been recent changes or updates to Genshin Impact specifics like rewards or exact quest mechanics might differ.
Unlocking
Prerequisites: Complete the previous parts of Prologue: Act III, especially the section right before this, which would typically involve dealing with or learning more about the Abyss Order's plans.
Quest Walkthrough 
1.Starting the Quest: After the preceding events, this quest likely begins automatically or by speaking with a key character like Jean or Venti near the Knights of Favonius Headquarters or at a significant location in Mondstadt.
2.Meeting at the Cathedral: Head to Mondstadt's Cathedral. Here, you might meet with Barbara or other characters to discuss a plan to purify or calm Dvalin (Stormterror).
3.Gather the Light Actuators: You'll be tasked with gathering items known as "Light Actuators" or similar artifacts. This could involve:
4.Exploration: Finding these items in specific locations around Mondstadt or its outskirts, possibly involving minor puzzles or combat with enemies guarding them.
5.NPC Interaction: Some might be given by NPCs after completing small tasks or conversations.
6.Set Up the Ceremony: Return to a designated area, likely near or in the Cathedral, where you'll set up the Light Actuators. This could involve:
7.Placing Items: Activating or placing the Light Actuators in specific spots.
8.Protecting the Ceremony: There might be a wave of enemies or an Abyss Mage attempting to disrupt the setup.
9.Perform the Ceremony: With everything in place, you'll initiate the ceremony. This might be a cutscene or an interactive segment where you need to use Venti's abilities or other characters to channel energy.
10.Confrontation with Dvalin: During or after the ceremony, expect some form of confrontation or interaction with Dvalin. This could involve:
11.A Battle: Fighting against Dvalin or defending against its attacks while trying to purify it.
12.Dialogue and Choices: Making decisions or speaking certain lines to calm or reason with Dvalin.
13.Quest Resolution: After successfully calming or dealing with Dvalin temporarily, return to Mondstadt to report back. This might lead to a discussion on the next steps or celebrating the partial success.
14.Ending and Preparation for Next Act: The quest concludes with setting the stage for what's to come next in dealing with Dvalin's situation and the Abyss Order's influence.
Quest Rewards
•Primogems: Standard reward for completing an important quest segment.
•Adventure Experience: A significant amount to help with Adventure Rank progression.
•Mora: For completing tasks and challenges within the quest.
•Character EXP Materials: Useful for leveling up characters.
•Enhancement Ores: For weapon enhancement.
Quest Tips 
•Party Composition: Ensure you have a balanced party with healers and elements that can deal with various types of enemies that might appear.
•Preparation: Before starting, stock up on healing items or cooked food that can provide buffs or healing.
•Elemental Reactions: Utilize characters' elemental skills effectively, especially if you're dealing with Abyss Mages again or elemental shields on Dvalin.
•Use Venti Wisely: If Venti is part of your team, his abilities can be crucial for environmental puzzles or crowd control during fights.
•Follow the Story: Pay attention to dialogues and cutscenes as they provide deeper insight into Genshin Impact's lore and your next steps.
If there have been changes or additional details introduced to this quest in updates post my last knowledge update, checking the in-game quest log or recent online guides from the Genshin community would ensure accuracy.
