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simgrammar the grammar of simulation

core loop

explore seeded biomes -> gather wood, stone, and ore -> build shelters that must be supported and roofed -> eat food for health and stamina -> craft better gear -> summon and defeat each biome's boss -> sail to harder biomes

design notes

Food is a reward rather than a punishment: eating raises maximum health and stamina and speeds regeneration, and there is no starvation, so the survival layer pushes players toward better food rather than threatening death. This consumable-buff model does not fit survival-meters cleanly (proposal filed). Building uses a support model in which stability falls with distance from the ground, so architecture follows material limits, and uncovered wood decays to half durability in rain. Progression is gated by eight bosses, each summoned with an offering. Early access began in February 2021 and 1.0 shipped in September 2026.

relations

15 stored edges
uses

Hand crafting

Workbenches, forges, and other stations craft tools, weapons, and building pieces; new materials unlock new recipes.

core
uses

Procedural terrain

Each world is generated from a seed and divided into biomes (Meadows, Black Forest, Swamp, Mountains, Plains, Ocean, Mistlands, Deep North, Ashlands), each with its own resources, enemies, and boss.

core
uses

Structural integrity

Stability runs from blue (grounded) to red; it falls with horizontal and vertical distance from ground, a piece cannot exceed its support's stability, and vertical limits are 16 m for wood and stone and 24 m for core wood.

core
uses

Agent skills

Skills rise to level 100 through use and affect damage and stamina drain; dying reduces skill levels.

supporting
uses

Animal husbandry

Some animals can be tamed and bred.

supporting
uses
supporting
uses

Decoration and beauty

Comfort from nearby furnishings lengthens the Rested buff.

supporting
uses
supporting
uses

Loss on death

On death the player's equipment and inventory stay in a tombstone at the death site, and skill levels drop, so the player must travel back to recover gear.

supporting
uses

Milestone unlocks

Each boss leaves a trophy that grants a power at a central altar and opens the next tier of materials.

supporting
uses

Modding API

No official API; mods load through the de facto BepInEx loader.

supporting
uses

Raid defense

Random events send enemies against bases.

supporting
uses

Survival meters

Food raises maximum health and stamina for a time instead of causing starvation; stamina drains when running or attacking.

supporting
uses

Wear and breakdown

Uncovered or submerged wood decays to 50% durability; tools lose durability.

supporting
uses

Weather

Rain wets the player and rots exposed wood.

supporting

sources

3
Wikipedia contributors (2026). Valheim. Wikipedia
Iron Gate Studio (2026). Valheim on Steam. Steam
Valheim Wiki contributors (2026). Building. Valheim Wiki (Fandom)

provenance

runs in log/runs
2026-10-24
created2026-10-24-catalog-gbcatalog
2026-10-25
reviewed2026-10-25-contributor-readinessmaintenance