Bone Spire

Build bone-covered monuments that store Bone Fragments, grow as they fill, and protect the surrounding area from hostile spawns.

The spires

	Greater Bone Spire	Lesser Bone Spire
Build cost	100 Bone Fragments + 10 Core Wood	20 Bone Fragments + 1 Core Wood
Inventory	8 columns × 4 rows	4 columns × 3 rows
Capacity	1,600 Bone Fragments	600 Bone Fragments
Growth	Increasing bone coverage on a fixed-height monument	One native 4m Core Wood pole, extending to two poles (8m)
Protection	Base radius grows from 0m to 50m as it fills	Adds 5m to each qualifying Greater Spire when full

Capacities assume the standard 50-fragment stack size. Mods that change stack sizes also change the spires' capacity and growth thresholds.

Both spires accept only Bone Fragments. Stored bones can be withdrawn, reversing their growth. Construction materials do not count toward inventory fill. An empty Lesser Spire is a bare 4m Core Wood pole. Bones and lashings build upward together. A second 4m pole appears when the bone covering reaches approximately three-quarters of the first pole, and is removed if enough bones are withdrawn. Both spires use the game’s original Core Wood meshes and materials.

Area protection

A Greater Spire’s own protection grows proportionally with its stored Bone Fragments: half full provides 25m, and full provides 50m. Each full Lesser Spire within the Greater Spire’s fixed 50m horizontal linking range adds another 5m. An empty Greater has no base protection, but can still receive bonuses from full Lessers.

A Lesser must contain its full bone capacity to contribute; occupying every slot with partial stacks is not enough. Withdrawing bones from a full Lesser immediately removes its bonus. Expanded protection does not recruit more distant Lessers, and a Lesser can contribute to multiple Greaters within range.

Equip the Hammer to see nearby Greaters’ protected boundaries projected onto the ground. While placing a spire, an additional amber ring marks the fixed 50m linking range. Where both boundaries coincide, only the protection ring is shown. Hover text reports the current radius and number of full Lesser contributors.

Protection blocks natural hostile spawns and raid attackers whose spawn locations fall inside the protected area. Ordinary neutral wildlife and Dvergr are unaffected. Existing enemies can still enter, and raids can still begin or spawn outside the boundary.

Boss summoning, physical creature spawners, console commands, and custom spawning systems from other mods are outside this protection.

Installation

Install Bone Spire through Thunderstore Mod Manager or r2modman, then launch Valheim through the manager. BepInExPack Valheim and Jotunn are required and are listed as package dependencies.

Both spires are available in the Hammer's Misc category / Storage tags. Discover Bone Fragments and Core Wood and have a workbench nearby to build them.

Updating

Update through your mod manager and restart Valheim. Existing spires use the new appearance and inventory dimensions automatically.

Stored items are retained. A spire with more stacks than its new grid can hold temporarily keeps extra rows so those items remain accessible. Withdraw the excess stacks to complete resizing. Additional deposits are disabled while those recovery rows are needed.

Compatibility

Early-access release for single-player Valheim. Multiplayer compatibility is not verified.

Empty and dismantle placed spires before removing the mod from a world you intend to keep.