Genshin Impact | Ancient Key Guide - How To Use & Location

Anemo
Anemo Traveler	Chasca
Jean	Kaedehara Kazuha
Mizuki	Varka
Venti	Wanderer
Xianyun	Xiao
Hydro
Childe	Columbina
Furina	Hydro Traveler
Ayato	Mona
Mualani	Neuvillette
Nilou	Kokomi
Sigewinne	Yelan
Geo
Albedo	Arataki Itto
Chiori	Geo Traveler
Linnea	Navia
Xilonen	Zhongli
Zibai
Electro
Clorinde	Cyno
Electro Traveler	Flins
Ineffa	Keqing
Raiden Shogun	Varesa
Yae Miko
Dendro
Alhaitham	Baizhu
Dendro Traveler	Emilie
Kinich	Lauma
Nahida	Nefer
Tighnari
Pyro
Arlecchino	Dehya
Diluc	Durin
Hu Tao	Klee
Lyney	Mavuika
Nicole	Pyro Traveler
Yoimiya
Cryo
Aloy	Citlali
Escoffier	Eula
Ganyu	Kamisato Ayaka
Lohen	Qiqi
Sandrone	Shenhe
Skirk	Wriothesley

Anemo
Ifa	Jahoda
Lan Yan	Lynette
Prune	Sayu
Shikanoin Heizou	Sucrose
Hydro
Aino	Barbara
Candace	Dahlia
Xingqiu
Geo
Gorou	Illuga
Kachina	Ningguang
Noelle	Yun Jin
Electro
Beidou	Dori
Fischl	Iansan
Kujou Sara	Kuki Shinobu
Lisa	Ororon
Razor	Sethos
Dendro
Collei	Kaveh
Kirara	Yaoyao
Pyro
Amber	Bennett
Chevreuse	Gaming
Thoma	Xiangling
Xinyan	Yanfei
Cryo
Charlotte	Chongyun
Diona	Freminet
Kaeya	Layla
Mika	Rosaria

Last Updated: August 23, 2026 11:19 AM

Ancient Key is a quest item in Genshin Impact. Guide includes how to get, map & location, how to use, Aqueous Tidemarks, Liliacruces Forum, Institute of Natural Philosophy, & more.

Table of Contents

What Is It
How To Get
How To Use

Fontaine Guide

What Is Ancient Key?

Quest Item

Ancient Key is an important item that can be obtained at the Liliacruces Forum during the Aqueous Tidemarks quest. This is used to open the path to the Institute of Natural Philosophy.

How To Get Ancient Key?

Start Aqueous Tidemarks Quest

Talk To Virgil At The Court Of Fontaine

Map	Location

You cannot get the Ancient Key without progressing with the Aqueous Tidemarks quest.

Aqueous Tidemarks Quest Guide

How To Use Ancient Key?

Open Underwater Gate

Interact with the mechanism to use the Ancient Key and open the gate to proceed with the Aqueous Tidemarks quest.

Fontaine Related Articles

Map & Puzzle Related

Map & Collectibles
Hydroculus		Shrine of Depths
Local Specialties & Materials
Marcotte	Lumidouce Bell		Rainbow Rose
Tidalga	Beryl Conch		Romaritime Flower
Lumitoile	Subdetection Unit		-

Fontaine Domains

Artifact Domains

Domain	Key Drops
Denouement Of Sin
Faded Theater
Waterfall Wen

Talent Book Domains

Domain	Key Drops
Pale Forgotten Glory

Weapon Ascension Material Domains

Domain	Key Drops
Echoes of the Deep Tides

Weekly Boss Domains

Domain	Key Drops
Shadow of Another World

Fontaine Characters

Fontaine 5 Star Characters
Clorinde	Emilie	Escoffier	Furina
Lyney	Navia	Neuvillette	Sigewinne
Wriothesley	-	-	-
Fontaine 4 Star Characters
Charlotte	Chevreuse	Freminet	Lynette

Other Fontaine Guides

Other Fontaine Guides
Fontaine Forgeable Weapon	Fontaine Fishing Spot
Fontaine Aircrafts	Fontaine Luxurious Chests
Mysterious Ore	Thorny Cyst
Pufferfruit Challenge	Potential Energy Orb
Anecdota Septentrionalis Book	-

DPS				Support				Sustain
On-Field						Off-Field

Mondstadt	Liyue
Inazuma	Sumeru
Fontaine	Natlan
Nod-Krai	Snezhnaya

Alyosha	Danica
Mitya	Noy
Odette	Tsaritsa
Valeriy	Vesna
Vodyanitsa

Anemoculus			Shrine of Depths
Calla Lily			Cecilia
Dandelion Seed			Philanemo Mushroom
Small Lamp Grass			Valberry
Windwheel Aster			Wolfhook

Geoculus			Shrine of Depths
Cor Lapis			Glaze Lily
Jueyun Chili			Noctilucous Jade
Qingxin			Silk Flower
Starconch			Violetgrass