Aqueous Tidemarks is a World Quest introduced in Genshin Impact 4.0. See how to unlock this quest, its walkthrough, and all the rewards of this quest here in this guide!

How to Unlock Aqueous Tidemarks

Complete the Prerequisites

Quest Unlock Requirements
	Aha! Looks like Aqueous Tidemarks is not locked behind any quest!

Go to the Court of Fontaine

Aqueous Tidemarks is located at Court of Fontaine Region, in the nation of Fontaine. You can find Virgil, who will give you the quest, right in front of the area's Statue of the Seven!

How to Get to Fontaine and Map Guide

Aqueous Tidemarks Walkthrough

Search for and Collect Clues

You agreed to help Virgil investigate the headquarters of Lliacruces Forum, now a drowned ruin. After preparing his diving gear, you will be teleported to a shore south of the Court of Fontaine.

Get in the water and dive southward while investigating the marked spots on the map. There are a total of four clues to collect along the way.

Explore the Former Site of the Liliacruces Forum

A few more meters past the fourth clue is the entrance to the Insitute of Natural Philosophy. At the center of this room is a chest guarded by three Hunter's Rays (the green ones).

Use your Transoceanic Sourcewater on the Xenochromatic Hunter's Ray (the blue one with a mark) to gain their water blade attack and defeat the green Hunter's Rays.

This will unlock the chest where the Ancient Key is found. It's a surprise tool that will help us later!

Note: If you've been in this area and opened the chest before starting Aqueous Tidemarks, you can find the Ancient Key inside one of the other chests in this room.

Proceed Deeper

Swim east and cut the nodes on the seagrasses to clear a path forward. You'll find a Xenochromatic Armored Crab at the end of the tunnel that you can absorb to gain shockwave attacks!

Shatter the rocks blocking the tunnel using your new ability. You'll find another roadblock ahead but with the Ancient Key from earlier, the next objective is just a few clicks away!

Search for and Collect Clues

Looks like you're almost there! Keep following the linear path until you reach the objective marker.

Use the Armored Crab's abilities to resist the high-pressure water vents, as well as defend yourself from the pesky Bullet Barnacles!

Leave the Marker and Talk to Virgil

After examining the shut door, ascend to the upper level and talk to Virgil.

Find a Way to Open a Path Forward

Circle around the room (or just get to the other end of the platform by swimming acrosss) to find a mechanism locked by Pneumousia Relays. The relays should all be in a Balanced state to remove the seal.

How to Solve the Pneumousia Relays Puzzle

To put it simply, the light in the relays should be colored green. You can do this by hitting the relay in Ousia state (purple) with a Pneuma (yellow) energy block. This also works the other way around.

	Opening the Path Forward
1	Pick up the Pneuma energy block near the edge and hit the Ousia relay.
2	Pick up the Ousia energy block at the top of the steps and hit the Pneuma relay.

Proceed Deeper

Dive back down into the water and go through the newly opened door on the lower floor. This corridor will lead you back to the floor above, but you need to jump back down through a hole at the end.

You don't have to descend too deep as your destination is just about the same level as where you jumped from. Don't forget to follow the objective marker in case you get lost!

Defeat the Clockwork Meka

Defeat the two Clockwork Mekas to proceed. They are stationary but can attack from a distance like turrets. Should be a piece of cake for you!

Proceed Deeper

Hmm... this Virgil guy is REALLY getting kinda suspicious. Oh well, we've already made it this far. Let's continue finding this treasure he's talking about!

Further down the path, you'll run into a Seelie. Following it will lead you to your destination and the next objective.

Defeat the Ruin Guard and Find a Way to Open the Door

There will be a Ruin Guard on standby at the other end of the hall. Approach it so it activates then defeat it so we can move on.

The other half of this objective is a little easier than the first. Simply go up the stairs and interact with the mechanism to open the gate.

Find the Secret Treasure!

Here we go! Examine the four marked spots in the room and see if you can find the treasure: (1) Kamera with some books, (2) buried machine, (3) Ruin Grader, (4) glass wall.

After checking and finding nothing, a cutscene will start. Hope you're ready for a fight!

Fight and Survive

This "Special" Ruin Grader moves and fights like any other. What makes it different is that it can repair itself back to its original state each time it runs out of HP.

Deplete its health bar twice and Paimon will point out that you can make use of the glass wall to defeat it. Hurry back to the glass wall and break it with your attacks to proceed.

Follow the Current...

Go with the flow as you get flushed out of the ruins to complete the quest. A Luxurious Chest should be waiting for you at the end, next to a teleport waypoint. Sweet!

Aqueous Tidemarks Rewards

Total Quest Rewards

Total Quest Rewards
Primogem x40	Mystic Enhancement Ore x5	Mora x30000
Hero's Wit x3	Adventure EXP x350

Genshin Impact Related Guides

All Quests and Quest Types

All Fontaine World Quests Guide

Fontaine World Quest Guides
A Certain Notice	“Hey, This Isn’t Pumpkin Soup…”	“If She No Longer Dreams of You...”
A Brush of Seafoam and Crimson	A Certain Stamp	A Certain Trifle
A Fontanian Message	A Gradient of Dreams and Ochre	A Letter
An Expected Lie	An Expected Plan	An Eye for An Eye
Ancient Colors	Ann of the Narzissenkreuz	Ann's Story: Prologue
Another Horizon of Adventure	Aqueous Tidemarks	Blue Longing of Heart and Moon
Book of Esoteric Revelations	Both Brains and Brawn	Canticles of Harmony
Cupid's Lover	Danger Lurks Everywhere in Fontaine	Daydreams Beyond Space and Time
Echoes of the Ancient World	Fishing Game	Foggy Forest Path
Fontaine Research Institute Chronicles	For Yesterday and Tomorrow	Fortune Plango Vulnera
Free Verse	Furious Mouth of the Spring	Game of the Rich
Good Stuff, but Terrible Taste	Gradus ad Capitolium	Happy Birthday
Hereafter...	Impromptu Poem of the Crimson Dawn	In Expert Company Part 1
In Expert Company Part 2	In Search of Lost Time	In the Wake of Narcissus
Initial Facts	Kingdom Through the Looking-Glass	Latecoming Homecoming
Leroy	Leroy: Beautiful Friends	Leroy: Dying Flash
Leroy: Firing Squad	Leroy: Hangman's Noose	Leroy: High Noon
Leroy: Queen of the Night's Aria	Leroy: Under Guard	Meteoric Lance
Muse's Mother	Pursuit	Questioning Melusine and Answering Machine
Questions and Answers	Road to the Singularity	Rowboat's Wake
Savior's Wake	Search in the Algae Sea	Self-Automatic Foraging
Seymour's Story: Prologue	Stagnating in the Rubble	Steambird Interview
Still Mouthwatering!	Strange Stone Chronicle	Thalia and Melpomene
The Final Question	The Fountain Flows Again	The Last Day of Remuria
The Lone Phantom Sail	The Narzissenkreuz Adventure	The Red and the Black
The Shadow Over Petrichor	The Three Primary Colors of Solar Corona	The Wild Fairy of Erinnyes
Through the Looking Glass	Treacherous Light of the Depths	Truly Mouthwatering!
Underwater Nocturne	Unfinished Comedy	Unfinished Story
Upon a Flowery Field of Grass	Vagrants and Scamps	Villains
Waking from the Great Dream	Were It So Easy	Where His Life Lies
Wilting Weeping Willow	Wish-Fulfilling Treasure Hunt	Within the Depths of Erinnyes

List of World Quests