Here's a detailed guide for Secret Pirate Treasure 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.
Image via HoYoverse.
Unlocking the Quest 
•Prerequisites: You need to have completed the Prologue: Act I - The Outlander Who Caught the Wind. This quest becomes available shortly thereafter as part of the early game progression in Mondstadt.
Quest Walkthrough
1.Meet Kaeya: Begin by talking to Kaeya at the Knights of Favonius Headquarters in Mondstadt. He'll introduce you to a tale of a secret pirate treasure.
2.Gather Clues: First Clue: Go to the Adventurer's Guild near the city's entrance and talk to Cyrus or another NPC like Jack. They'll give you some initial information or point you toward your first clue.
3.Windmill Climb: First Treasure: Climb to the top of one of Mondstadt's windmills. There, you'll find a note or a small treasure chest with your next clue.
4.Decipher the Map: Use the clue from the windmill to decipher a spot on your map. This might involve interacting with a Statue of The Seven to reveal hidden parts of your map.
5.Treasure Hunt: Second Treasure: Follow the map to a location outside Mondstadt, possibly near Starfell Lake or Whispering Woods. Here, you might need to solve a simple puzzle or defeat a few enemies.
6.Third Treasure: The second clue will lead you to another location, potentially involving more complex puzzles like lighting torches in a specific order or using Anemo abilities to clear obstacles.
7.Combat or Puzzle Challenge: At the final location, expect either a group of enemies, like Treasure Hoarders or a Ruin Guard, or a more intricate puzzle involving elements or moving platforms.
8.Claim the Treasure: After overcoming the challenge, you'll uncover the secret pirate treasure.
9.Return to Kaeya: Head back to Kaeya in Mondstadt to conclude the quest. He might share some lore about the pirates or reflect on the adventure.
Quest Rewards
•Adventure Experience: Around 250-300 XP.
•Mora: Approximately 3000-4000 Mora.
•Character EXP Materials: A few Hero's Wit or Adventurer's Experience.
•Enhancement Ore: Fine Enhancement Ore for weapon enhancement.
•Primogems: 30-40 Primogems for completing the quest.
Quest Tips 
•Use Elemental Sight: Often useful for finding hidden items or clues.
•Prepare for Combat: Even if puzzles are involved, there might be combat. Bring a balanced team.
•Gliding: Some clues might involve high places, so characters like Amber or Venti can be helpful for gliding.
•Pay Attention to NPC Dialogues: They often give hints about where to go next or how to solve puzzles.
•Exploration: Use this quest as an opportunity to explore areas around Mondstadt you might not have visited yet. There could be additional chests or Anemoculus along the way.
Remember, if there have been updates or changes to this quest after my last knowledge update, checking in-game details or recent online guides from the Genshin Impact community would provide the most current strategies and information.
