IDE: Visual Studio Community (Free) or JetBrains Rider.

Decompiler: dnSpy or ILSpy.

https://marketplace.visualstudio.com/items?itemName=SharpDevelopTeam.ILSpy

Why? You need this to look at Valheim's source code (Assembly-CSharp.dll) to see how the game works so you know what to change.

The Game: You obviously need Valheim installed.

https://www.nexusmods.com/valheim/mods/15?tab=description

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