Underkeep Locked Doors: Keys, Lockpicks, and Sealed Gates Explained

Few things stall an expedition faster than a door that simply will not budge. Underkeep locked doors are the game's main pacing tool, and treating every sealed gate as a lockpicking problem will cost you hours of backtracking. Once you understand how Underkeep locked doors actually work, you know when to search the next room, when to walk away, and when you are missing a quest item instead of a skill.

This guide breaks down every documented gate type in the game, from the Silver Key in the opening tunnels to the four Key Fragments that seal Underkeep Tower — and the tool-based obstructions that look like locked doors but aren't.

Start With the Map, Not the Lockpick

Underkeep is a first-person, grid-based dungeon crawler for a party of four, and you can follow its store listing through Underkeep on Steam. One of its most useful features is the automap. An early hands-on look at the game notes that the map tracks explored ground alongside locks, doors, treasure chests, and hidden traps such as pits.

That matters because "locked" is not one problem in this game. A gate might want a specific key, a tool, a training purchase, or simply a conversation you haven't had yet. Marking each one as you find it keeps a long dungeon crawl from turning into a memory test.

Player experience backs this up. In one recorded playthrough through the Hollow Grave Tunnels, the host found a door, checked his lockpicks, and asked the game outright how to pick it — only to realize the door wanted a special key instead. He hit the same wall repeatedly later: "What's the point of lockpicks if I can't lockpick?" The takeaway is simple. In Underkeep, locked doors come with an intended answer, and guessing burns supplies you'll want later.

The Four Kinds of Underkeep Locked Doors

Community walkthroughs and recorded playthroughs point to a handful of distinct gate types. Sorting your obstacle into the right category is usually enough to know whether to push forward or leave.

The important distinction is between doors that need an item and doors that need a state change. A guide page tracking known region order notes that Underkeep will lock a region until an earlier task is finished, and that some clues live on a different map from the door they open. In other words, a door that refuses you may be waiting on a conversation, not a key.

Key-Based Underkeep Locked Doors

The Silver Key Is Your First Real Checkpoint

The opening journey runs from the starting forest through the Hollow Grave Tunnels and the Orc Warehouse before looping back to the forest route toward the village. The Silver Key matters because it opens a passage required to continue toward the later forest section. If you feel walled in during the early tunnels, this is almost always why.

Three Golden Keys Gate the Mausoleum

The Source Gate inside the Mausoleum is a separate puzzle from anything in the tunnels. It requires three Golden Keys obtained from the High Clerics. That gate belongs to the Jacob disappearance and Blood Order investigation, and passing through it starts the Source Guardians encounter rather than ending it.

Four Key Fragments Seal Underkeep Tower

Underkeep Tower has its own ancient seal, and it does not use the Golden Keys. It requires four Key Fragments. One documented source is Torin, a roaming adventurer encountered near the tower, who sells a fragment for 300 Gold.

Placing a single fragment makes the mechanism respond — but the gate stays shut until the full set is in place. That reaction is the game's way of confirming you're on the right track, not a bug. Keep at least 300 Gold in reserve when you head toward the tower, and don't confuse the tower's four-fragment seal with the Mausoleum's three-key gate. They are different locks on different doors.

When Underkeep Locked Doors Aren't Doors at All

Some obstacles look like locks but respond to training. At the Dwarven Camp, Brenna Ironsong sells two separate skills:

• Clear Hard Cave-ins — 30 Gold. Teaches you to break hard rock obstructions and hands over a heavy Pickaxe.
• Mine Gold Veins — 40 Gold. Teaches you to extract gold from deposits and provides a dwarven Chisel.

These are separate purchases, so buy the one that matches the blockage in front of you. A pickaxe alone is not the same as the training. In one playthrough, the host stood at a gold vein with a pickaxe already in his pack and was told he lacked the knowledge to extract the gold. Bare hands fail too — soft dig spots return a message that you tried digging without success and may need a tool.

If you bounced off an obstacle early, note its location and come back after a trip to the camp. The same route often opens without a single fight.

Quest Gates: The Doors You Can't Judge Yet

Some of the most annoying Underkeep locked doors never needed a key at all. Two documented examples show how conversation-driven gating works.

Garric stops your party near the village entrance and asks you to clear burrowing enemies to the south before he lets you through. Khelebar, the village alchemist, wants rune records copied from four Obelisks around the tower before he hands over the Teleportation Stone — which shortens every future return trip and makes re-checking sealed doors far cheaper.

Notes work as keys too. A letter found in the tunnels mentions a ruby hidden in a secret passage near the warehouse, which is a location rather than an item. That kind of clue never appears in a key inventory, so read what you pick up.

Before you write a door off, run this checklist:

• Record the exact wording of the refusal message; it usually names the requirement.
• Check whether the door blocks the main route or an optional treasure room.
• Scan the map for unvisited branches in the same region.
• Review your quest log for a task you started but never finished.
• Carry Gold rather than spending it all on gear.
• Keep quest letters and odd items instead of selling them.

A community walkthrough of the main progression is handy here, because it separates story gates from optional ones — see this Underkeep progression and tower guide for the sequence of checkpoints. For a plain statement of what is and isn't documented publicly, the Underkeep region-order walkthrough is refreshingly honest about the gaps.

FAQ

Can you lockpick every door in Underkeep? No. Player experience from recorded playthroughs shows that some doors explicitly require a special key and cannot be picked, even with lockpicks in your inventory and a thief-type character in the party. Treat lockpicks as one option among several rather than a universal answer to Underkeep locked doors.

How many Key Fragments does Underkeep Tower need? Four. Torin, found roaming near the tower, sells one for 300 Gold, and the remaining fragments come from other objectives. Inserting a single fragment triggers a reaction from the seal but does not open the gate.

Are the three Golden Keys used on the tower? No. The three Golden Keys come from the High Clerics and open the Mausoleum's Source Gate. Underkeep Tower uses a completely separate four-fragment seal, so don't carry one set of keys to the other location and assume you're covered.

Why can't I clear a cave-in with a pickaxe? Because the pickaxe is only half of the requirement. You need Brenna Ironsong's Clear Hard Cave-ins training, which costs 30 Gold at the Dwarven Camp and includes a heavy Pickaxe. Her gold-vein mining skill is a separate 40 Gold purchase with its own tool.