diff --git a/.github/workflows/pr-build.yml b/.github/workflows/pr-build.yml
index 57945be..4166c17 100644
--- a/.github/workflows/pr-build.yml
+++ b/.github/workflows/pr-build.yml
@@ -30,7 +30,7 @@ jobs:
 
             - name: Restore dependencies
               run: |
-                  dotnet nuget add source --username "${{ github.actor }}" --password "${{ secrets.GITHUB_TOKEN }}" --store-password-in-clear-text --name github "${{ env.NUGET_SOURCE }}"
+                  dotnet nuget add source --username "${{ secrets.ORG_PACKAGE_USERNAME }}" --password "${{ secrets.ORG_PACKAGE_TOKEN }}" --store-password-in-clear-text --name github "${{ env.NUGET_SOURCE }}"
                   dotnet restore ${{ env.PROJECT }}
 
             # - name: Run tests
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 00dd80d..1787fb4 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -77,8 +77,8 @@ jobs:
             - name: Setup Github NuGet
               run: |
                   dotnet nuget add source \
-                  --username ${{ github.actor }} \
-                  --password ${{ secrets.GITHUB_TOKEN }} \
+                  --username ${{ secrets.ORG_PACKAGE_USERNAME }} \
+                  --password ${{ secrets.ORG_PACKAGE_TOKEN }} \
                   --store-password-in-clear-text \
                   --name github "https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json"
 
diff --git a/StarMap.API/BaseAttributes.cs b/StarMap.API/BaseAttributes.cs
index f5df406..d5ecb5a 100644
--- a/StarMap.API/BaseAttributes.cs
+++ b/StarMap.API/BaseAttributes.cs
@@ -19,7 +19,33 @@ public abstract class StarMapMethodAttribute : Attribute
     }
 
     /// <summary>
-    /// Methods marked with this attribute will be called immediately when the mod is loaded.
+    /// Methods marked with this attribute will be called before KSA is started.
+    /// </summary>
+    /// <remarks>
+    /// Methods using this attribute must match the following signature:
+    ///
+    /// <code>
+    /// public void MethodName();
+    /// </code>
+    ///
+    /// Specifically:
+    /// <list type="bullet">
+    ///   <item><description>No parameters are allowed.</description></item>
+    ///   <item><description>Return type must be <see cref="void"/>.</description></item>
+    ///   <item><description>Method must be an instance method (non-static).</description></item>
+    /// </list>
+    /// </remarks>
+    public class StarMapBeforeMainAttribute : StarMapMethodAttribute
+    {
+        public override bool IsValidSignature(MethodInfo method)
+        {
+            return method.ReturnType == typeof(void) &&
+                   method.GetParameters().Length == 0;
+        }
+    }
+
+    /// <summary>
+    /// Methods marked with this attribute will be called immediately when the mod is loaded by KSA.
     /// </summary>
     /// <remarks>
     /// Methods using this attribute must match the following signature:
diff --git a/StarMap.API/StarMap.API.csproj b/StarMap.API/StarMap.API.csproj
index 0529043..ba6aec8 100644
--- a/StarMap.API/StarMap.API.csproj
+++ b/StarMap.API/StarMap.API.csproj
@@ -11,7 +11,7 @@
 	</ItemGroup>
 
 	<ItemGroup Condition="'$(Configuration)' != 'Debug'">
-		<PackageReference Include="StarMap.KSA.Dummy" Version="1.0.6">
+		<PackageReference Include="StarMap.KSA.Dummy" Version="1.0.9">
 			<IncludeAssets>compile; build; analyzers</IncludeAssets>
 			<PrivateAssets>all</PrivateAssets>
 		</PackageReference>
diff --git a/StarMap.Core/ModRepository/LoadedModRepository.cs b/StarMap.Core/ModRepository/LoadedModRepository.cs
index c7c8aa5..1f316e4 100644
--- a/StarMap.Core/ModRepository/LoadedModRepository.cs
+++ b/StarMap.Core/ModRepository/LoadedModRepository.cs
@@ -8,7 +8,10 @@ namespace StarMap.Core.ModRepository
     internal class LoadedModRepository : IDisposable
     {
         private readonly AssemblyLoadContext _coreAssemblyLoadContext;
+
         private readonly Dictionary<string, StarMapMethodAttribute> _registeredMethodAttributes = [];
+        private readonly Dictionary<string, bool> _attemptedMods = [];
+        private readonly Dictionary<string, ModAssemblyLoadContext> _modLoadContexts = [];
 
         private readonly ModRegistry _mods = new();
         public ModRegistry Mods => _mods;
@@ -38,23 +41,72 @@ public LoadedModRepository(AssemblyLoadContext coreAssemblyLoadContext)
                 .ToDictionary();
         }
 
-        public void LoadMod(Mod mod)
+        public void Init()
+        {
+            PrepareMods();
+        }
+
+        private void PrepareMods()
+        {
+            ModLibrary.PrepareManifest();
+
+            var mods = ModLibrary.Manifest.Mods;
+            if (mods is null) return;
+
+            string rootPath = "Content";
+            string path = Path.Combine(new ReadOnlySpan<string>(in rootPath));
+
+            foreach (var mod in mods)
+            {
+                var modPath = Path.Combine(path, mod.Id);
+
+                if (!LoadMod(mod.Id, modPath))
+                {
+                    _attemptedMods[mod.Id] = false;
+                    continue;
+                }
+
+                if (_mods.GetBeforeMainAction(mod.Id) is (object @object, MethodInfo method))
+                {
+                    method.Invoke(@object, []);
+                }
+                _attemptedMods[mod.Id] = true;
+            }
+        }
+
+        public void ModPrepareSystems(Mod mod)
         {
-            var fullPath = Path.GetFullPath(mod.DirectoryPath);
-            var filePath = Path.Combine(fullPath, $"{mod.Name}.dll");
-            var folderExists = Directory.Exists(fullPath);
-            var fileExists = File.Exists(filePath);
+            if (!_attemptedMods.TryGetValue(mod.Id, out var succeeded))
+            {
+                succeeded = LoadMod(mod.Id, mod.DirectoryPath);
+            }
 
-            if (!folderExists || !fileExists) return;
+            if (!succeeded) return;
+
+            if (_mods.GetPrepareSystemsAction(mod.Id) is (object @object, MethodInfo method))
+            {
+                method.Invoke(@object, [mod]);
+            }
+        }
+
+        private bool LoadMod(string modId, string modDirectory)
+        {
+            var fullPath = Path.GetFullPath(modDirectory);
+            var modAssemblyFile = Path.Combine(fullPath, $"{modId}.dll");
+            var assemblyExists = File.Exists(modAssemblyFile);
 
-            var modLoadContext = new ModAssemblyLoadContext(mod, _coreAssemblyLoadContext);
-            var modAssembly = modLoadContext.LoadFromAssemblyName(new AssemblyName() { Name = mod.Name });
+            if (!assemblyExists) return false;
 
-            var modClass = modAssembly.GetTypes().FirstOrDefault(type => type.IsDefined(typeof(StarMapModAttribute), inherit: false));
-            if (modClass is null) return;
+            var modLoadContext = new ModAssemblyLoadContext(modId, modDirectory, _coreAssemblyLoadContext);
+            var modAssembly = modLoadContext.LoadFromAssemblyName(new AssemblyName() { Name = modId });
+
+            var modClass = modAssembly.GetTypes().FirstOrDefault(type => type.GetCustomAttributes().Any(attr => attr.GetType().Name == typeof(StarMapModAttribute).Name));
+            if (modClass is null) return false;
 
             var modObject = Activator.CreateInstance(modClass);
-            if (modObject is null) return;
+            if (modObject is null) return false;
+
+            _modLoadContexts.Add(modId, modLoadContext);
 
             var classMethods = modClass.GetMethods();
             var immediateLoadMethods = new List<MethodInfo>();
@@ -73,16 +125,12 @@ public void LoadMod(Mod mod)
                         immediateLoadMethods.Add(classMethod);
                     }
 
-                    _mods.Add(attr, modObject, classMethod);
+                    _mods.Add(modId, attr, modObject, classMethod);
                 }
             }
 
-            foreach (var method in immediateLoadMethods)
-            {
-                method.Invoke(modObject, [mod]);
-            }
-
-            Console.WriteLine($"StarMap - Loaded mod: {mod.Name}");
+            Console.WriteLine($"StarMap - Loaded mod: {modId} from {modAssemblyFile}");
+            return true;
         }
 
         public void OnAllModsLoaded()
@@ -100,6 +148,11 @@ public void Dispose()
                 method.Invoke(@object, []);
             }
 
+            foreach (var modLoadContext in _modLoadContexts.Values)
+            {
+                modLoadContext.Unload();
+            }
+
             _mods.Dispose();
         }
     }
diff --git a/StarMap.Core/ModRepository/ModAssemblyLoadContext.cs b/StarMap.Core/ModRepository/ModAssemblyLoadContext.cs
index 9217a8b..92b7b9f 100644
--- a/StarMap.Core/ModRepository/ModAssemblyLoadContext.cs
+++ b/StarMap.Core/ModRepository/ModAssemblyLoadContext.cs
@@ -2,26 +2,26 @@
 using System.Reflection;
 using System.Runtime.Loader;
 
-namespace StarMap.Core
+namespace StarMap.Core.ModRepository
 {
     internal class ModAssemblyLoadContext : AssemblyLoadContext
     {
         private readonly AssemblyLoadContext _coreAssemblyLoadContext;
         private readonly AssemblyDependencyResolver _modDependencyResolver;
 
-        public ModAssemblyLoadContext(Mod mod, AssemblyLoadContext coreAssemblyContext)
+        public ModAssemblyLoadContext(string modId, string modDirectory, AssemblyLoadContext coreAssemblyContext)
             : base(isCollectible: true)
         {
             _coreAssemblyLoadContext = coreAssemblyContext;
 
             _modDependencyResolver = new AssemblyDependencyResolver(
-                Path.GetFullPath(Path.Combine(mod.DirectoryPath, mod.Name + ".dll"))
+                Path.GetFullPath(Path.Combine(modDirectory, modId + ".dll"))
             );
         }
 
         protected override Assembly? Load(AssemblyName assemblyName)
         {
-            var existingInDefault = Default.Assemblies
+            var existingInDefault = AssemblyLoadContext.Default.Assemblies
                 .FirstOrDefault(a => string.Equals(a.GetName().Name, assemblyName.Name, StringComparison.OrdinalIgnoreCase));
             if (existingInDefault != null)
                 return existingInDefault;
@@ -31,12 +31,24 @@ public ModAssemblyLoadContext(Mod mod, AssemblyLoadContext coreAssemblyContext)
             if (existingInGameContext != null)
                 return existingInGameContext;
 
+            if (_coreAssemblyLoadContext != null)
+            {
+                try
+                {
+                    var asm = _coreAssemblyLoadContext.LoadFromAssemblyName(assemblyName);
+                    if (asm != null)
+                        return asm;
+                }
+                catch (FileNotFoundException)
+                {
+                }
+            }
+
             var foundPath = _modDependencyResolver.ResolveAssemblyToPath(assemblyName);
             if (foundPath is null)
                 return null;
 
-            var path = Path.GetFullPath(foundPath);
-            return path != null ? LoadFromAssemblyPath(path) : null;
+            return LoadFromAssemblyPath(Path.GetFullPath(foundPath));
         }
     }
 }
diff --git a/StarMap.Core/ModRepository/ModRegistry.cs b/StarMap.Core/ModRepository/ModRegistry.cs
index ffd9c0b..40e1b3b 100644
--- a/StarMap.Core/ModRepository/ModRegistry.cs
+++ b/StarMap.Core/ModRepository/ModRegistry.cs
@@ -1,23 +1,31 @@
-using StarMap.API;
+using KSA;
+using StarMap.API;
 using System.Reflection;
 
 namespace StarMap.Core.ModRepository
 {
     internal sealed class ModRegistry : IDisposable
     {
-        private readonly Dictionary<Type, List<(StarMapMethodAttribute attribute, object @object, MethodInfo method)>> _map = new();
+        private readonly Dictionary<Type, List<(StarMapMethodAttribute attribute, object @object, MethodInfo method)>> _map = [];
+        private readonly Dictionary<string, (object @object, MethodInfo method)> _beforeMainActions = [];
+        private readonly Dictionary<string, (object @object, MethodInfo method)> _prepareSystemsActions = [];
 
-        public void Add(StarMapMethodAttribute attribute, object @object, MethodInfo method)
+        public void Add(string modId, StarMapMethodAttribute attribute, object @object, MethodInfo method)
         {
             var attributeType = attribute.GetType();
 
-            // --- add instance ---
             if (!_map.TryGetValue(attributeType, out var list))
             {
                 list = [];
                 _map[attributeType] = list;
             }
 
+            if (attribute.GetType() == typeof(StarMapBeforeMainAttribute))
+                _beforeMainActions[modId] = (@object, method);
+
+            if (attribute.GetType() == typeof(StarMapImmediateLoadAttribute))
+                _prepareSystemsActions[modId] = (@object, method);
+
             list.Add((attribute, @object, method));
         }
 
@@ -39,6 +47,16 @@ public void Add(StarMapMethodAttribute attribute, object @object, MethodInfo met
                 : Array.Empty<(StarMapMethodAttribute attribute, object @object, MethodInfo method)>();
         }
 
+        public (object @object, MethodInfo method)? GetBeforeMainAction(string modId)
+        {
+            return _beforeMainActions.TryGetValue(modId, out var action) ? action : null;
+        }
+
+        public (object @object, MethodInfo method)? GetPrepareSystemsAction(string modId)
+        {
+            return _prepareSystemsActions.TryGetValue(modId, out var action) ? action : null;
+        }
+
         public void Dispose()
         {
             _map.Clear();
diff --git a/StarMap.Core/Patches/ModPatches.cs b/StarMap.Core/Patches/ModPatches.cs
index 7934da2..69ce5b0 100644
--- a/StarMap.Core/Patches/ModPatches.cs
+++ b/StarMap.Core/Patches/ModPatches.cs
@@ -10,7 +10,7 @@ internal static class ModPatches
         [HarmonyPrefix]
         public static void OnLoadMod(this Mod __instance)
         {
-            StarMapCore.Instance?.LoadedMods.LoadMod(__instance);
+            StarMapCore.Instance?.LoadedMods.ModPrepareSystems(__instance);
         }
     }
 }
diff --git a/StarMap.Core/StarMap.Core.csproj b/StarMap.Core/StarMap.Core.csproj
index facc085..e70bf3f 100644
--- a/StarMap.Core/StarMap.Core.csproj
+++ b/StarMap.Core/StarMap.Core.csproj
@@ -20,7 +20,7 @@
 	</ItemGroup>
 
 	<ItemGroup Condition="'$(Configuration)' != 'Debug'">
-		<PackageReference Include="StarMap.KSA.Dummy" Version="1.0.6">
+		<PackageReference Include="StarMap.KSA.Dummy" Version="1.0.9">
 			<ExcludeAssets>runtime</ExcludeAssets>
 		</PackageReference>
 	</ItemGroup>
diff --git a/StarMap.Core/StarMapCore.cs b/StarMap.Core/StarMapCore.cs
index 0690665..4f54870 100644
--- a/StarMap.Core/StarMapCore.cs
+++ b/StarMap.Core/StarMapCore.cs
@@ -24,6 +24,7 @@ public StarMapCore(AssemblyLoadContext coreAssemblyLoadContext)
 
         public void Init()
         {
+            _loadedMods.Init();
             _harmony.PatchAll(typeof(StarMapCore).Assembly);
         }
 
diff --git a/StarMap/GameSurveyer.cs b/StarMap/GameSurveyer.cs
index 08e531a..a706090 100644
--- a/StarMap/GameSurveyer.cs
+++ b/StarMap/GameSurveyer.cs
@@ -32,6 +32,15 @@ public bool TryLoadCoreAndGame()
 
             _game = _gameAssemblyContext.LoadFromAssemblyPath(_gameLocation);
 
+            var gameDirectory = Path.GetDirectoryName(_gameLocation);
+            if (string.IsNullOrWhiteSpace(gameDirectory) || !Directory.Exists(gameDirectory))
+            {
+                Console.WriteLine("StarMap - Game directory not found");
+                return false;
+            }
+
+            Directory.SetCurrentDirectory(gameDirectory);
+
             _core = core;
             core.Init();
             return true;
@@ -42,15 +51,7 @@ public void RunGame()
             Debug.Assert(_game is not null, "Load needs to be called before running game");
 
             string[] args = [];
-
-            var gameDirectory = Path.GetDirectoryName(_gameLocation);
-            if (string.IsNullOrWhiteSpace(gameDirectory) || !Directory.Exists(gameDirectory))
-            {
-                Console.WriteLine("StarMap - Game directory not found");
-                return;
-            }
-
-            Directory.SetCurrentDirectory(gameDirectory);
+            
             _game.EntryPoint!.Invoke(null, [args]);
         }