Under Lock and Key
Unlock a Vault with a Trial Key
Requirements: Find a Vault block in a Trial Chamber and use a Trial Key to unlock it.
Advancement Made!Under Lock and KeyOverview
Under Lock and Key is a task advancement in the Adventure tab of Minecraft's advancement system, carrying the in-game description "Unlock a Vault with a Trial Key." It branches directly off Minecraft: Trial(s) Edition, so that earlier advancement is its prerequisite and must be earned first. The Adventure tab covers advancements focused on exploration, combat, trading, and interacting with the world and its inhabitants. Under Lock and Key was added in Minecraft 1.21, part of the Tricky Trials update, and is still in the 26.2 advancement set.
It is rated Medium difficulty on this site: requires some preparation or specific resources. Part of normal gameplay progression. It uses the standard task frame, meaning it is a normal step in the tree rather than a goal or challenge milestone. One further advancement, Revaulting, is gated behind it.
In tree terms, Under Lock and Key sits second along its line: the full path from the Adventure root reads Adventure -> Minecraft: Trial(s) Edition -> Under Lock and Key. That means 2 advancements must be completed before this one becomes available, and Under Lock and Key is one of 47 total advancements in the Adventure tab. It shares its parent with 4 sibling advancements (Who Needs Rockets?, Blowback, Lighten Up, and Over-Overkill), all of which open from the same point in the tree.
How to Complete Under Lock and Key
Earning Under Lock and Key comes down to the following, performed in order:
- Find a Vault block in a Trial Chamber and use a Trial Key to unlock it.
- Trial Keys drop from trial spawners after completing the combat challenge.
- Each vault can only be unlocked once per player.
Tips & Fastest Route
Tips & Fastest Route- Fastest route: Use a Trial Key on a vault in a Trial Chamber.
- Trial Keys drop from trial spawners once you clear their combat wave.
- Each vault gives loot to each player once, so several players can share one vault.
- Make sure Minecraft: Trial(s) Edition is already ticked off before you start, otherwise Under Lock and Key will not be tracked even if you perform the steps correctly.
- At Medium difficulty, Under Lock and Key is a routine step once you have the prerequisites in hand; no special grinding is usually needed beyond the items the steps call for.
Common Mistakes
Common Mistakes- Remember that Under Lock and Key will not appear as available until Minecraft: Trial(s) Edition is done, since the game only tracks an advancement once its parent has been unlocked.
Reward & What It Unlocks
Reward & What It UnlocksUnder Lock and Key grants no experience directly; its value is progression rather than a point payout.
Earning it unlocks Revaulting, which becomes the next step along this branch of the tree.
Details
Advancement ID
Category
Version AddedAdvancement Tree
Parent Advancement
