Weather Altar

v1.0.3·Updated 2026-09-14

Build a Weather Altar and pay coins and blood to change the weather worldwide for a limited time. Solo and co-op friendly; server-synced settings.

About this mod Author’s original text

Weather Altar

How it works

  • Build the Weather Altar (found beside the vanilla Ward in the hammer menu — it uses the same building materials).
  • Interact with it to open the offering menu.
  • Choose the weather and press Offer.
  • Pay 10 Coins + 10 HP (defaults) — the sacrifice never kills you.
  • The weather lasts 10 minutes of real time, then natural weather returns.

Buying a new offering replaces the active one and restarts the duration.

Multiplayer

Works in solo, hosted co-op, and dedicated servers. The mod must be installed on the server and every client. The accepted offering is shared by everyone — one player's offering changes the weather for the whole session.

Server-restart note: the temporary weather effect is session-based and ends when the server/world session ends. The altar itself persists in the save as normal.

Configuration (server-synced)

Settings live in BepInEx/config/com.mous.weatheraltar.cfg under the [Offering] section. On multiplayer servers, values are server-controlled and pushed to all clients (admins only):

| Setting | Default | Description |

| --- | --- | --- |

| CoinCost | 10 | Coins required per offering (1–10000) |

| HealthCost | 10 | Health sacrificed per offering (1–1000) |

| DurationSeconds | 600 | Real-time duration of the effect (10–3600) |

Details

  • The altar reuses the vanilla Ward model and building recipe; the ward's protective force field is not part of it.
  • Weather is applied through the game's own environment override path: dungeons, scripted events, and indoor areas keep their normal environments. Clear is not daylight — time of day is unaffected.
  • Sleeping does not pause or extend the timer; the countdown runs in real time while the session is open.

Tech notes

Built on Jötunn and BepInEx. Offering transactions are quote-validated by the server; prices that change mid-purchase are rejected safely without consuming resources.

Installation

Install Mod Manager or r2modman (dependencies are pulled automatically), or manually place WeatherAltar.dll into BepInEx/plugins.

Install & use Install: BepInEx plugin

  1. The archive from playbuff is the mod itself — usually a BepInEx plugin (a .dll or a plugin folder once unzipped).
  2. Recommended: use a community mod manager (such as r2modman) — pick this game, import the mod, and the manager sets up BepInEx and its dependencies for you.
  3. Manual route: install the BepInEx loader in the game folder, then drop the unzipped .dll or plugin folder into BepInEx/plugins/.
  4. Launch the game — the BepInEx console logs every plugin it loads; seeing this mod in the log means it is installed.

Mods with listed dependencies need those installed too, or they will not load. Options are usually changed in-game or in the plugin's config file. In multiplayer, the host and every client need the same mods installed.

Dependencies

Install these first, or the mod will not work:

denikson-BepInExPack_ValheimValheimModding-Jotunn

File & checksum

Filename
Weather_Altar-1.0.3.zip
File size
116.7 KiB