Under Lock and Key
Unlock a Vault using a Trial Key
Overview
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 using 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 remains part of the current 1.21 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 40 total advancements in the Adventure tab. No other advancement shares its parent, so it is the only thing that branches from Minecraft: Trial(s) Edition.
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 UnlocksCompleting Under Lock and Key grants 10 experience points. The XP drops at your position the moment the advancement fires.
Earning it unlocks Revaulting, which becomes the next step along this branch of the tree.
Details
Advancement ID
Category
Version AddedAdvancement Tree
Parent Advancement
Child Advancements (1)
Under Lock and Key Advancement FAQ
How do you get the Under Lock and Key advancement in Minecraft?
Use a Trial Key on a vault in a Trial Chamber. In full, 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.
What do you need for Under Lock and Key?
Before you can work on it you must have completed Minecraft: Trial(s) Edition. 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.
Which advancement tab is Under Lock and Key in?
Under Lock and Key is in the Adventure tab, hanging beneath Minecraft: Trial(s) Edition. Its in-game advancement ID is minecraft:adventure/use_vault.
Is Under Lock and Key part of the Minecraft: Trial(s) Edition branch?
Yes. Under Lock and Key sits directly below Minecraft: Trial(s) Edition in the Adventure tree, so you must earn Minecraft: Trial(s) Edition first. Completing Under Lock and Key then opens Revaulting.
How much XP does Under Lock and Key give and how hard is it?
Under Lock and Key awards 10 XP and is rated Medium difficulty.
When was Under Lock and Key added to Minecraft?
Under Lock and Key was added in Minecraft Java Edition 1.21 and is present in the current 1.21 advancement set.