To reach the Secret Chamber in Grim Trials, current post-launch player documentation points to the Academy basement and a hidden eye-marked door that opens while the Camouflage Cloak is equipped. Entering the room unlocks the Tomb Raider achievement/trophy. The same chamber also contains the Grim Reaper Chest tied to Buried Knowledge, but opening that chest requires additional side-quest progress and two keys.
What is the Secret Chamber?
The Secret Chamber is one of Grim Trials' hidden Academy locations. Its clearest official confirmation comes from the achievement system: Xbox and PlayStation lists describe Tomb Raider as “Find and Enter Secret Chamber.” Steam also lists Tomb Raider among the game's 29 achievements, although the Steam public page hides the description for some secret achievements.
That distinction matters because the achievement confirms the room exists and that simply entering it is enough for Tomb Raider, but it does not tell you how to open the door. For the route itself, the strongest current documentation comes from a post-launch trophy walkthrough that connects the chamber to Iskra's quest progression, the Camouflage Cloak and the Academy basement.
How to enter the Secret Chamber
The player-tested route is straightforward once the required side content is available:
- Progress Iskra's side quests far enough to unlock the quest commonly translated as The Cartographer.
- Complete that quest's Trial Ground exploration objective. The walkthrough reports that this rewards the Camouflage Cloak recipe.
- Craft the Camouflage Cloak.
- Equip the cloak before trying the hidden door.
- Go to the Academy basement and look for the eye-marked door near the basement area connected to Iskra's side of the Academy.
- With the cloak equipped, the hidden door should be open. Enter it to trigger Tomb Raider.
The most important step is equipping the cloak. Merely owning or crafting it is not the same as wearing it. The post-launch route specifically describes the door as opening when the Camouflage Cloak is equipped, so if you reach the basement and the entrance remains closed, check your active gear before assuming the quest is bugged.
How the Camouflage Cloak fits into the quest chain
The same post-launch walkthrough reports that Iskra offers the Cartographer quest after sufficient earlier side-quest progress and after the player has advanced far enough through the bosses. Its stated task is to explore every room in the second Trial Ground area, after which the Camouflage Cloak recipe becomes available.
This gives the Secret Chamber a useful place in the larger progression loop. It is not simply a wall you can inspect at the beginning of the game. The route is connected to Academy relationship content, Trial Ground exploration and crafting. If the cloak recipe has not appeared yet, the safer assumption is that you are missing earlier quest progression rather than that the basement door itself is broken.
Because quest names can vary by localization, this guide avoids treating one translated quest title as universal. Use the objective and NPC sequence as the reliable identifiers: Iskra-related side content, a Trial Ground mapping/exploration task, then the Camouflage Cloak recipe.
Tomb Raider achievement
Tomb Raider only requires you to find and enter the Secret Chamber. Xbox achievement data, PlayStation trophy data and Exophase all agree on that requirement. You do not need to open the special chest inside the room for Tomb Raider itself.
This is useful for troubleshooting. If you enter the chamber but cannot yet open the chest, Tomb Raider should still be conceptually separate from the chest objective. The chest is tied to another secret achievement, Buried Knowledge, whose requirement is to open the first Grim Reaper Chest.
Secret Chamber vs. Buried Knowledge
The two achievements are closely connected but should not be merged into one instruction. Tomb Raider = enter the room. Buried Knowledge = open the Grim Reaper Chest. The trophy route places that chest inside the Secret Chamber and says the player needs two keys obtained through additional Breone and Nameles side-quest progress.
That later route reportedly involves one Nameles quest that asks for Spirit Potions and a Breone quest that asks for Luck Potions. Completing those steps provides the two keys needed for the chest. Because these quantities and quest sequences come from third-party post-launch testing, the dedicated Grim Reaper Chests guide will treat them as version-dated routing rather than immutable game rules.
For now, the practical lesson is simple: if your only goal is Tomb Raider, entering the chamber is enough. If your goal is Buried Knowledge or 100% completion, continue the Breone and Nameles side-quest chains instead of leaving immediately after the first achievement appears.
Secret Chamber door not opening
If the hidden basement door does not open, check the prerequisites in a sensible order. First, confirm that you have actually crafted the Camouflage Cloak. Second, equip it rather than leaving it in inventory. Third, verify that you completed the Iskra quest that awarded the recipe and that your Academy side-quest chain is not waiting on earlier character content.
It is also worth checking location before assuming a technical problem. The player-tested route describes the chamber as an Academy basement secret, not a random Secret Chamber generated inside a Trial Ground run. If you are searching Trial Ground rooms for the Tomb Raider location, you are looking in the wrong activity.
Why the Secret Chamber matters for 100% completion
The chamber intersects several of the game's completion systems at once. Tomb Raider is one of the three secret achievement/trophy objectives documented on platform trackers. Buried Knowledge is another. The route also passes through side quests and crafting, which are already relevant to Affinity progress, Fashionista, Weapon Connoisseur and the broader True Ending preparation route documented by current player guides.
That makes the Secret Chamber worth doing even if you are not specifically chasing trophies. It is a natural checkpoint for Academy exploration and character-side progression, and it leads directly into the Grim Reaper Chest chain that will be covered separately.
Secret Chamber video status
A fresh YouTube search on September 6, 2026 did not surface a focused current-version Secret Chamber or Tomb Raider walkthrough that was strong enough to embed as evidence. Rather than use an unrelated trailer or an unclear clip, this page keeps the route text-based until a clean current-version video can be verified.
Secret Chamber FAQ
Where is the Secret Chamber in Grim Trials?
Current post-launch player documentation places it in the Academy basement behind an eye-marked hidden door.
How do I open the Secret Chamber door?
The documented route requires crafting and equipping the Camouflage Cloak, whose recipe comes from an Iskra-related exploration quest.
What does Tomb Raider require?
Find and enter the Secret Chamber.
Do I need to open the chest for Tomb Raider?
No. Opening the Grim Reaper Chest is tied to Buried Knowledge, a separate secret achievement.
Is the Secret Chamber in the Trial Ground?
The documented achievement route places this chamber in the Academy basement, not as a normal Trial Ground room.
Related Grim Trials guides
Sources & verification
- Steam achievements — confirms Tomb Raider exists among the 29 achievements.
- XboxAchievements — confirms Tomb Raider = Find and Enter Secret Chamber and Buried Knowledge = Open The First Grim Reaper Chest.
- TrueAchievements — independent achievement requirement confirmation.
- TrueTrophies — PlayStation trophy confirmation.
- Gamerbase post-launch trophy guide — player-tested Camouflage Cloak, Academy basement, hidden door and Grim Reaper Chest routing.
