Clear Winding Tunnels and build frost production

Before you start

• A tested landing and fallback from the Deep North foothold guide.
• A rested combat kit, durable light source, spare food and enough free inventory space for cores and moulds.
• Fifteen Iron and forty Stone stored at the production site if you want to build both pieces immediately after returning. Their current researched costs are listed below.

Search villages, then verify the entrance

1. Search newly generated Deep North for an abandoned village and mark it before entering.
2. Inspect the largest multi-storey building for a large opening in the floor. Several current guides report this entrance pattern; it is a search method, not a promise that every village has the same layout.
3. Confirm that the transition identifies Winding Tunnels in your current game. Some launch coverage called them Hidden Tunnels; this edition uses Iron Gate’s official name.
4. Leave a marked exterior recovery point and enter with room in your inventory rather than moving the entire foothold to an unconfirmed dungeon.

Mechanics sources: SteamDB: Valheim 1.0 patch notes (build 25185596)PC Gamer: how to get the Intricate KeyPostmode: completed Deep North walkthroughredfreshet: Winding Tunnels and Intricate Key guide

Clear with a retraceable pattern

1. Choose one direction at each junction, clear enemies before harvesting and mark exhausted branches with a repeatable dropped-item or building-piece convention where the dungeon permits it.
2. Look overhead and along walls for blue Frostcores. Do not leave after the first one if you intend to build both production pieces.
3. Inspect floors and wall edges for flat dark moulds. Break wooden debris only after the room is safe, then check the newly exposed floor again.
4. Prioritize the Mould: Intricate Key, but keep equipment moulds too. If the needed mould does not appear, finish the safe branches and search another village rather than claiming a guaranteed drop.
5. Exit on the known route, store the haul and repair before a second run. A cleared path is more valuable than one overloaded death run.

Mechanics sources: PC Gamer: how to get the Intricate KeyPostmode: completed Deep North walkthroughredfreshet: Winding Tunnels and Intricate Key guide

Build the production pair at a recoverable base

The official notes confirm both pieces. PC Gamer, Postmode and redfreshet agree on the construction costs below. These are current 1.0 researched references, not a local installed-build extraction; check the Hammer preview before consuming materials.

1. Carry Ice to reveal or confirm the Frigid Kiln in the current build menu, and carry Frostcores to confirm both pieces.
2. Place the Frigid Kiln and Frost Foundry where their inputs and outputs remain reachable. Do not bury either in a decorative enclosure until one batch completes.
3. Feed Ice to the Frigid Kiln and confirm that it produces Liquid Frost. Keep the first output beside the Frost Foundry instead of spending it on optional crafts.

Mechanics sources: SteamDB: Valheim 1.0 patch notes (build 25185596)PC Gamer: how to get the Intricate KeyPostmode: completed Deep North walkthroughredfreshet: Winding Tunnels and Intricate Key guide

You are ready when…

When something goes wrong

Sources & checks

Default survival rules · 1.0 release context checked 9 September 2026. Each source carries its own check date below; those dates do not certify every mechanic on this page for the current build. Shopping targets, route choices, and combat tactics are editorial recommendations. No firsthand gameplay test is claimed. How to read the evidence.

1. SteamDB: Valheim 1.0 patch notes (build 25185596)

   Deep North, Kall Fimbulbringer, Winding Tunnels, Mörkhalla, environmental hazards, production pieces, new materials, events and updated Fader Relic functionality shipped in 1.0.

   Community reference · Checked 2026-09-10. Build-indexed record of Iron Gate’s official 1.0 notes. It confirms released names and broad mechanics, but does not establish the walkthrough order or exact recipes by itself.

2. PC Gamer: how to get the Intricate Key

   Village-floor tunnel search, Frostcores, key moulds, Frigid Kiln and Frost Foundry costs, Bloodgold cast production and the completed-key sequence.

   Community reference · Checked 2026-09-10. Launch-day researched walkthrough with screenshots. Its route and production costs are corroborated by Postmode and redfreshet, but no installed build or retained raw test record is provided.

3. Postmode: completed Deep North walkthrough

   Winding Tunnels, Frostcore production, Fader-reward Ember production, Bloodgold, Intricate Key, Mörkhalla, the Jotun invasion, Malicious Blood and Aesir Passage are described as one route.

   Community reference · Checked 2026-09-10. Independent launch-day walkthrough based on a completed PS5 playthrough. It conflicts with other sources on some display names, so this edition uses Iron Gate’s official names and avoids treating aliases as separate items.

4. redfreshet: Winding Tunnels and Intricate Key guide

   Abandoned-village entrance search, Frostcore and mould collection, Bloodgold cast, Liquid Frost production and the key-to-Mörkhalla relationship.

   Community reference · Checked 2026-09-10. Japanese launch-day specialist guide labeled for Valheim 1.0. Its underlying observation record is not public, so it is corroboration rather than build verification.