**IDE:** [[https://www.google.com/url?sa=E&q=https://visualstudio.microsoft.com/vs/community/|Visual Studio Community]] (Free) or JetBrains Rider.

**Decompiler:** [[https://www.google.com/url?sa=E&q=https://github.com/dnSpy/dnSpy|dnSpy]] or [[https://www.google.com/url?sa=E&q=https://github.com/icsharpcode/ILSpy|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|https://www.nexusmods.com/valheim/mods/15?tab=description]]