Concord lets a mod change what a game does while it's running, without touching the game files.

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Start Here

The core ideas: patches, targets, callbacks, and shadows. No jargon.

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Your First Patch

A guided walk-through from game code to applied injection.

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Common Tasks

The patch shapes you'll use most: head, return, around, cancel, reverse.

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How Patches Work

The mental model: wrappers, detours, pristine clones, and the apply flow.

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Implementation Status

What's built today, what's planned, and the layer-by-layer progress.

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Contributor Architecture

For those working on Concord itself: layers, composition flow, and emit internals.

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CampfireWarmthPatch.cs

abstract class CampfireWarmthPatch : Campfire
{
    [Inject(nameof(GetWarmth), At.Return)]
    void AfterGetWarmth(CallbackInfo<int> ci)
    {
        ci.ReturnValue += 5;
    }
}

Before

Campfire.cs

public int GetWarmth()
{
    return fuel * 2;
}

→

After patch

GetWarmth (runtime)

public int GetWarmth()
{
    int result = fuel * 2;
    result += 5;
    return result;
}