Current answer
There is still not enough evidence for an “all ten locations” guide.
The original poster later says they found the last item through another gate system. That establishes a clue, not a reproducible location: no gate identity, path, input, screenshot, or counter change is shown.
The exact tenth Ancient Vault clue location remains unverified as of the August 10 source check.
What players actually reported
The thread moves beyond nine only as an unverified text claim.
This table summarizes the full player thread; it is not an official collectible checklist.
Theory boundary
“Another gate system” is a lead, not a solution.
A reply asks which gate system and whether it is still in the bunker below the elevator; no answer follows. Another player guesses the next vault door, then says it would not open. Without a screenshot, path, interaction sequence, or completion confirmation, the thread cannot support a How-to title.
Patch 1.03 boundary
A client-side bunker-door fix may be relevant, but it is not puzzle proof.
Patch 1.03 says a bunker door in the Ancient Facilities that clients could not open has been fixed.
The patch note does not name the Ancient Vault objective, the tenth clue, or the gate described by the player. It may remove one multiplayer blocker, but connecting it to 9/10 would be an inference.
Update threshold
What would turn this into a guide.
- Location proof: a clear screenshot or video frame that identifies the final clue and its surroundings.
- Action proof: the interaction needed and any prerequisite door, item, quest, or Layer state.
- Result proof: the counter visibly changing from 9/10 to 10/10 in the same version.
- Version proof: the game build or patch date so later changes do not inherit a stale answer.
Source ledger
What was read, and where the evidence stops.
Ancient secrets / vault need help
- Publisher
- Steam Community players
- Applies to
- Windows launch build through Patch 1.03 source check
- Read
- Original post and all three replies visible at the latest check.
- Supports
- Multiple players were stuck at 9/10 after finding the rocket ship, notes, and two radios; the original poster later said the last item was through another gate system.
- Limit
- The poster gives no route, gate identifier, interaction sequence, screenshot, or visible 10/10 result. Another player still could not open the next vault door, so a reproducible location guide is not supported.
- Checked
- Aug 10, 2026
Patch 1.03
- Publisher
- GRAIN ROT developer news
- Applies to
- Patch 1.03 on Windows
- Read
- Full announcement body and all three listed fixes.
- Supports
- Fixes for an Ancient Facilities bunker door that clients could not open, saves loading into a black void, and key bindings not saving correctly.
- Limit
- The note does not identify the bunker door as the Ancient Vault tenth clue, document a complete puzzle route, or claim that every door and save issue is fixed.
- Checked
- Aug 15, 2026
GRAIN ROT — official Steam store page
- Publisher
- Beck & Branch Games / Neem Interactive
- Applies to
- Windows launch build
- Read
- Full store copy, feature list, requirements, categories, embedded-media descriptions, and screenshots.
- Supports
- Core loop, Vessels and Sparks, Outpost progression, Windows support, release date, controller support, and official media provenance.
- Limit
- Does not document exact keybinds, item drop rates, puzzle answers, or a public server-status dashboard.
- Checked
- Aug 15, 2026