diff --git a/lib/inventory/distributed-service/service-module.nix b/lib/inventory/distributed-service/service-module.nix
index 5c07ea894..865595ae0 100644
--- a/lib/inventory/distributed-service/service-module.nix
+++ b/lib/inventory/distributed-service/service-module.nix
@@ -859,7 +859,11 @@ in
                   instanceRes.nixosModule
                 ]
                 ++ (map (
-                  s: if builtins.typeOf s == "string" then "${directory}/${s}" else s
+                  s:
+                  if builtins.typeOf s == "string" then
+                    lib.warn "String types for 'extraModules' will be deprecated - ${s}" "${directory}/${s}"
+                  else
+                    lib.setDefaultModuleLocation "via inventory.instances.${instanceName}.roles.${roleName}" s
                 ) instanceCfg.roles.${roleName}.extraModules);
               };
             }
diff --git a/modules/inventoryClass/role.nix b/modules/inventoryClass/role.nix
index 650cc56d1..f80204c4d 100644
--- a/modules/inventoryClass/role.nix
+++ b/modules/inventoryClass/role.nix
@@ -44,12 +44,6 @@ in
       description = ''
         List of additionally imported `.nix` expressions.
 
-        Supported types:
-
-        - **Strings**: Interpreted relative to the 'directory' passed to `lib.clan`.
-        - **Paths**: should be relative to the current file.
-        - **Any**: Nix expression must be serializable to JSON.
-
         !!! Note
             **The import only happens if the machine is part of the service or role.**
 
@@ -74,7 +68,7 @@ in
             ```
       '';
       default = [ ];
-      type = types.listOf types.deferredModule;
+      type = types.listOf types.raw;
     };
   };
 }
diff --git a/pkgs/clan-cli/clan_lib/api/__init__.py b/pkgs/clan-cli/clan_lib/api/__init__.py
index d3a0f8504..148806854 100644
--- a/pkgs/clan-cli/clan_lib/api/__init__.py
+++ b/pkgs/clan-cli/clan_lib/api/__init__.py
@@ -243,7 +243,11 @@ API.register(get_system_file)
             if "oneOf" not in return_type:
                 msg = (
                     f"Return type of function '{name}' is not a union type. Expected a union of Success and Error types."
-                    # @DavHau: no idea wy exactly this leads to the "oneOf" ot being present, but this should help
+                    # If the SuccessData type is unsupported it was dropped by Union narrowing.
+                    # This is probably an antifeature
+                    # Introduced because run_generator wanted to use:
+                    # Callable[[Generator], dict[str, str]]
+                    # In its function signature.
                     "Hint: When using dataclasses as return types, ensure they don't contain public fields with non-serializable types"
                 )
                 raise JSchemaTypeError(msg)
diff --git a/pkgs/clan-cli/clan_lib/nix_models/clan.py b/pkgs/clan-cli/clan_lib/nix_models/clan.py
index 5cf42e02a..e2bd4563c 100644
--- a/pkgs/clan-cli/clan_lib/nix_models/clan.py
+++ b/pkgs/clan-cli/clan_lib/nix_models/clan.py
@@ -28,13 +28,11 @@ class InventoryInstanceRoleMachine(TypedDict):
 
 
 
-InventoryInstanceRoleExtramodulesType = list[Unknown]
 InventoryInstanceRoleMachinesType = dict[str, InventoryInstanceRoleMachine]
 InventoryInstanceRoleSettingsType = Unknown
 InventoryInstanceRoleTagsType = dict[str, Any] | list[str]
 
 class InventoryInstanceRole(TypedDict):
-    extraModules: NotRequired[InventoryInstanceRoleExtramodulesType]
     machines: NotRequired[InventoryInstanceRoleMachinesType]
     settings: NotRequired[InventoryInstanceRoleSettingsType]
     tags: NotRequired[InventoryInstanceRoleTagsType]
diff --git a/pkgs/classgen/main.py b/pkgs/classgen/main.py
index e064d23b1..937b91d8a 100644
--- a/pkgs/classgen/main.py
+++ b/pkgs/classgen/main.py
@@ -241,6 +241,11 @@ def generate_dataclass(
         # If we are at the top level, and the attribute name is not explicitly included we only do shallow
         field_name = prop.replace("-", "_")
 
+        # Skip "extraModules"
+        # TODO: Introduce seperate model that is tied to the serialization format
+        if "extraModules" in field_name:
+            continue
+
         # if len(attr_path) == 0 and prop in shallow_attrs:
         #     field_def = field_name, "dict[str, Any]"
         #     fields_with_default.append(field_def)