Ægir's Wrath

Ægir's Wrath is a Valheim mod that gradually raises the world's sea level over time, flooding coastlines, settlements, and low-lying terrain.

The sea rises continuously throughout each in-game day until it reaches a configurable maximum elevation. Terrain and structures are not modified.

Features

• Gradual sea-level rise based on in-game time.
• Configurable starting day and rise rate.
• Configurable maximum sea level.
• Automatic updates to water in loaded zones.
• Configurable update interval.
• Fixed sea-level override for testing.
• Preserves vanilla waves and weather effects.
• No terrain modifications.

Requirements

• Valheim
• BepInEx 5

Installation

1. Install BepInEx 5.
2. Place AegirsWrath.dll in BepInEx/plugins.
3. Launch Valheim to generate the configuration file.

Configuration

Configuration file: BepInEx/config/EZB.AegirsWrath.cfg

Setting	Default	Description
Enabled	true	Enables or disables the mod.
StartDay	100	In-game day when flooding begins.
MetersPerDay	0.05	Sea-level rise in meters per in-game day.
MaxSeaLevel	200	Maximum absolute sea level in meters.
OverrideSeaLevel	-1	Fixed sea level for testing. -1 disables the override.
UpdateIntervalSeconds	2	Interval between water updates in real seconds.
VerboseLogging	false	Enables diagnostic logging.

Flood Mechanics

Valheim's baseline sea level is 30 meters.

Once the configured starting day is reached, sea level rises at the configured rate. The increase is gradual throughout the day rather than occurring at day transitions.

For example, with MetersPerDay = 0.05, the sea rises 5 centimeters per in-game day.

The maximum sea level is an absolute elevation, not an increase above the original sea level. With MaxSeaLevel = 200, flooding stops at 200 meters, or 170 meters above the original sea level.

Water elevations are updated periodically across loaded zones, including newly loaded zones encountered during exploration.

Testing

Set OverrideSeaLevel to a nonnegative value to force a fixed water elevation.

For example, OverrideSeaLevel = 60 sets the water surface to 60 meters.

Set OverrideSeaLevel = -1 to resume normal day-based progression.

The override is limited by MaxSeaLevel.

Notes

• Existing terrain and structures remain unchanged.
• Buildings, vegetation, and terrain can become submerged.
• The maximum sea level can be adjusted to control the extent of flooding.
• Lowering the configured maximum can lower the water level.
• Multiplayer behavior and water interactions at extreme elevations have not been fully validated.
• Back up existing worlds before enabling the mod.