What can you do as a free member?

Member benefits illustration

Create your free account today and unlock all our premium features and tools to enhance your gaming experience.

Member benefits illustration

Create your free account today and save articles to your watchlist and get notified when they're updated with new information.

Member benefits illustration

Create your free account today and save your favorite games for quick access later, synced across all your devices.

Member benefits illustration

By creating a Game8 account and logging in, you'll receive instant notifications when someone replies to your posts.

Comment rating feature illustration

By creating a Game8 account and logging in, you can make use of convenient features in the comments section, such as rating and sorting comments.

Site Interface

Guest
Free Member
Article Watchlist
Game Bookmarks
Cross-device Sync
Light/Dark Theme Toggle
User Profiles
Direct Feedback
Comment Rating

Game Tools

Guest
Free Member
Interactive Map Access
Interactive Map Pins
Interactive Map Comments
Interactive Map Pins Cross-Device
Check List
Event Choice Checker
Deck Builder Cross-Device
Message Board Notification
Message Board Cross-Device
Build Planner
Stat Calculator
Diagnostic Tool
Weapon/Armor Wishlist

Want more information?Learn more

Hell is Us

Lost Keys Walkthrough and Rewards

Add to Watchlist

★ Trending: Puzzles | Codes | Jeljin | NG+
☆ Starting out? Check our Beginner's Guide
┗ Combat | Builds | Weapons | Tier List
★ Walkthrough | Good Deeds | Mysteries
┗ Timeloops | Vaults | NPCs | Enemies
☆ Missables | Game Length | Trophies

Lost Keys Walkthrough and Rewards
Lost Keys is one of the Mysteries in Hell is Us. Check out the complete guide on how to solve Lost Keys, as well as how to unlock it and its rewards!

List of Contents

Lost Keys Walkthrough

  1. Find Keys at the Bottom of the Reservoir
  2. Use Key at General Store at Marastan

1. Find Keys at the Bottom of the Reservoir

1.1
Lost Keys - Finding the Note at the Bulletin Board
At Lake Cynon, head down to the cliff overlooking the lake and beside the field of blue flowers. Interact with the bulletin board to prompt the Mystery Lost Keys.
1.2
Hell is Us Hit the Pillars in Order
Head down the hill and head towards the reservoir in the distance. Hit the pillars in the following order:
Crown → Water → Key → Star → Cup
1.3
Lost Keys - Use the Spindle
Take the spindle from the stone compartment near the tables and insert it to the mechanism to drain the water from the reservoir.
1.4
Lost Keys - Picking Up Keys Algae at Bottom of Reservoir
At the bottom, you'll find the Keys - Algae beside the stairs. Now to find where the key fits!

2. Use Key at General Store at Marastan

2.1
Lost Keys - Head Up the Hill to the General Store
Drive your APC to Marastan, and find Samo's General Store. Head up the hill ahead of your APC to start making your way to the store.
2.2
Lost Keys - Fighting Primeval connected to Haze of Grief
There are two Primevals connected to a Haze of Grief in front of the general store. Clear them to safely unlock the chest.
2.3
Lost Keys - Use the Keys Algae to Unlock the Chest at the General Store
Use the Key - Algae on the chest at the back of the store. You will be rewarded with the Cap - Terror, a cosmetic item Rémi can equip.

Lost Keys Rewards

All Quest Rewards

Rewards:
Cap - Terror Cap - Terror

These are the list of rewards you can obtain upon completing the Lost Keys Mystery.

How to Unlock Lost Keys

Investigate the Bulletin Board at Lake Cynon

Investigating the bulletin board at Lake Cynon will reveal a note that mentions lost keys that may be found at the reservoir. Picking this up will start a new Mystery. You can find the bulletin board overlooking the lake.

Hell is Us Related Guides

Hell is Us - Mysteries Partial

All Mysteries Guide

List of All Mysteries

Ascetic VowsAscetic Vows BlackmailedBlackmailed Caddell Family TreasureCaddell Family Treasure
Emergency StashEmergency Stash EnlightenmentEnlightenment EternityEternity
Family FirstFamily First Great ResponsibilityGreat Responsibility History LessonHistory Lesson
Ill-Gotten GainsIll-Gotten Gains Lax SecurityLax Security Locked DownLocked Down
Lost KeysLost Keys Lucky BreakLucky Break Lymbic Chest - Acasa Eastern RuinsLymbic Chest - Acasa Eastern Ruins
Lymbic Chest - Acasa VitalisLymbic Chest - Acasa Vitalis' Basement Lymbic Chest - Jeljin Archeology CampLymbic Chest - Jeljin Archeology Camp Lymbic Chest - Lake Cynon ReservoirLymbic Chest - Lake Cynon Reservoir
Lymbic Chest - Lymbic Forge DormitoryLymbic Chest - Lymbic Forge Dormitory Lymbic Chest - Lymbic Forge HallLymbic Chest - Lymbic Forge Hall Lymbic Chest - Lymbic Forge WaterfallLymbic Chest - Lymbic Forge Waterfall
Lymbic Chest - Marastan RuinsLymbic Chest - Marastan Ruins Lymbic Chest - Temple of the FallenLymbic Chest - Temple of the Fallen Lymbic Chest - Vyssa Hills FortLymbic Chest - Vyssa Hills Fort
Lymbic Door - Acasa Western MonumentLymbic Door - Acasa Western Monument Lymbic Door - Lymbic ForgeLymbic Door - Lymbic Forge Lymbic Door - Senedra HilltopLymbic Door - Senedra Hilltop
Lymbic Door - Senedra UndergroundLymbic Door - Senedra Underground Martial LineageMartial Lineage Observation Outpost 08Observation Outpost 08
OvergrownOvergrown PilgrimagePilgrimage Righteous ProtectionRighteous Protection
SafekeepingSafekeeping Secret APC Cache Supply ChainSupply Chain
Suspicious ActivitySuspicious Activity The CaptainThe Captain's Office The ConspiracyThe Conspiracy
The HermitThe Hermit The HideoutThe Hideout The ProtectorThe Protector
The Secrets of the RamThe Secrets of the Ram WhistleblowersWhistleblowers

Comment

Post (0 Comments)

Author

Hell is Us Walkthrough Team
This article was created by Game8's elite team of writers and gamers.
    Leave feedback(Login required)
    Tell Us More About You!

    Rankings

    Popular Articles
    Message Board
    • We could not find the message board you were looking for.

    Gaming News

    Digimon Story: Time Stranger Review [Demo] | Pokémon Better Watch Out

    Digimon Story: Time Stranger Review [Demo]

    Popular Games

    Recommended Games

    All rights reserved

    ©2025 – Nacon

    The copyrights of videos of games used in our content and other intellectual property rights belong to the provider of the game.
    The contents we provide on this site were created personally by members of the Game8 editorial department.
    We refuse the right to reuse or repost content taken without our permission such as data or images to other sites.

    Hell is Us Walkthrough & Guides Wiki

    Quick Access
    Guide Index

    Recommended Guides

    Walkthrough

    Act 1 Investigations

    Act 2 Investigations

    Act 3 Investigations

    Puzzles

    Mysteries

    All Mysteries

    Lymbic Doors and Chests

    Good Deeds

    All Good Deeds

    NPCs

    Weapons

    Weapon Types

    All Swords

    All Twin Axes

    All Polearms

    All Greatswords

    Vaults

    Enemies

    Bosses

    Relics

    Relics by Type

    Active Relics

    Passive Relics

    Items

    Item Types

    Defensive Gear

    All Defensive Gear

    Glyphs

    Glyph by Rank

    Base Glyphs

    Enhanced Glyphs

    Elite Glyphs

    Drone Modules

    All Drone Modules

    Cosmetics

    Latest News and Game Info