Search newly generated abandoned villages, especially their largest multi-storey buildings, for a floor opening into Winding Tunnels. Clear and mark each branch, inspect overhead blue Frostcores and break searchable wooden debris for moulds. Return with enough Frostcores for both production pieces; vanilla build 25185596 stores 20 Stone + 10 Frostcore + 5 Ice for the Frigid Kiln and 15 Iron + 20 Stone + 10 Frostcore for the Frost Foundry.
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 build-25185596 costs are listed below.
Search newly generated Deep North for an abandoned village and mark it before entering.
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.
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.
Leave a marked exterior recovery point and enter with room in your inventory rather than moving the entire foothold to an unconfirmed dungeon.
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.
Look overhead and along walls for blue Frostcores. Do not leave after the first one if you intend to build both production pieces.
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.
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.
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.
The exact construction inputs below are now verified against serialized Piece records in the installed vanilla Steam build 25185596. The same extraction links the Frigid Kiln’s Ice fuel to the internal FrozenFuel output used by the Frost Foundry. Those are stored defaults, not a recorded gameplay cycle; still check the Hammer and station prompts before consuming materials.
Carry Ice to reveal or confirm the Frigid Kiln in the current build menu, and carry Frostcores to confirm both pieces.
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.
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.
Check the largest buildings and their floors, then move to another village in newly generated terrain. The observed entrance pattern is common, not guaranteed for every ruin.
I found Frostcores but no key mould.
Clear safe branches, break wooden debris and recheck the exposed floor. If the dungeon is exhausted, mark it and search another village; no fixed mould count per tunnel is promised here.
The production piece is still missing from my Hammer.
Carry the listed ingredients yourself, especially Frostcore and Ice, then inspect the current build categories. Nearby chest contents do not count as discovered inventory.
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 ·
Local vanilla extraction: Deep North build 25185596 ↗Build 25185596 directly verifies the three displayed construction/crafting input sets and the bounded Eternal Pyre, frost-production, Intricate Key, Mörkhalla-door and Kall-offering relationships.local ·
PC Gamer: how to get the Intricate Key ↗Village-floor tunnel search, Frostcores, key moulds, frost production, Bloodgold cast production and the completed-key sequence.community ·
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 ·
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6:48–7:10 · 22 sA snowed-in longhouse with a hole in the floor down to the tunnels