diff --git a/flake.nix b/flake.nix
index 2819c94..bb45831 100755
--- a/flake.nix
+++ b/flake.nix
@@ -25,8 +25,8 @@
     sops-nix,
     ...
   } @ inputs: let
-    helpers = import ./helpers.nix inputs;
-    inherit (helpers) mergeHosts mkHost;
+    flock.lib = import ./lib inputs;
+    inherit (flock.lib) mergeHosts mkHost;
   in
     mergeHosts [
       (mkHost "muskduck" {
@@ -45,11 +45,6 @@
         ];
       })
 
-      # (mkHost "docker" {
-      #   suite = "vm";
-      #   user = "docker";
-      # })
-
       (mkHost "minecraft" {
         suite = "vm";
         user = "docker";
diff --git a/helpers.nix b/helpers.nix
deleted file mode 100644
index 73616be..0000000
--- a/helpers.nix
+++ /dev/null
@@ -1,137 +0,0 @@
-inputs:
-with inputs;
-with inputs.nixpkgs.lib; {
-  mergeHosts = lists.foldl' (
-    a: b: attrsets.recursiveUpdate a b
-  ) {};
-
-  mkHost = hostname: {
-    platform ? "x86_64-linux",
-    suite,
-    user ? "fern",
-    extraModules ? [],
-  }: let
-    system = platform;
-    secrets = builtins.toString inputs.secrets;
-
-    pull-requests = {
-      fluffychat = import nixpkgs-pr-fluffychat {
-        inherit system;
-        overlays = [
-          (final: prev: {
-            fluffychat = prev.fluffychat.overrideAttrs (prevAttrs: rec {
-              desktopItems = [
-                ((builtins.elemAt prevAttrs.desktopItems 0).override {startupWMClass = "fluffychat";})
-              ];
-            });
-          })
-        ];
-      };
-
-      feishin = import nixpkgs-pr-feishin {
-        inherit system;
-        overlays = [
-          (final: prev: {
-            feishin = prev.feishin.overrideAttrs (prevAttrs: rec {
-              pname = "feishin";
-              version = "0.18.0";
-
-              src = prev.fetchFromGitHub {
-                owner = "jeffvli";
-                repo = "feishin";
-                rev = "v${version}";
-                hash = "sha256-4gcS7Vd7LSpEByO2Hlk6nb8V2adBPh5XwWGCu2lwOA4=";
-              };
-
-              pnpmDeps = prev.pnpm_10.fetchDeps {
-                inherit pname version src;
-                hash = "sha256-1MGxrUcfvazxAubaYAsQuulUKm05opWOIC7oaLzjr7o=";
-              };
-            });
-          })
-        ];
-      };
-    };
-
-    userPackages = final: prev: {
-      # WebOne HTTP proxy.
-      webone = prev.pkgs.callPackage ./packages/webone {};
-      # Yazi Gruvbox theme.
-      yazi-flavour-gruvbox-dark = prev.pkgs.callPackage ./packages/yazi-flavour-gruvbox {};
-      # Latest FluffyChat.
-      fluffychat = pull-requests.fluffychat.fluffychat;
-      # Latest Feishin.
-      feishin = pull-requests.feishin.feishin;
-      # PrismLauncher with Temurin JRE.
-      prismlauncher = prev.prismlauncher.override {
-        jdks = [
-          prev.pkgs.temurin-jre-bin
-        ];
-      };
-    };
-
-    pkgs = import nixpkgs {
-      inherit system;
-      config = {
-        allowUnfree = true;
-        permittedInsecurePackages = [
-          "dotnet-sdk-6.0.428"
-          "dotnet-runtime-6.0.36"
-        ];
-      };
-      overlays = [
-        userPackages
-      ];
-    };
-
-    deployPkgs = import nixpkgs {
-      inherit system;
-      overlays = [
-        deploy-rs.overlays.default
-        (self: super: {
-          deploy-rs = {
-            inherit (pkgs) deploy-rs;
-            lib = super.deploy-rs.lib;
-          };
-        })
-      ];
-    };
-  in
-    {
-      nixosConfigurations.${hostname} = nixosSystem {
-        inherit system pkgs;
-
-        specialArgs = {
-          inherit
-            hostname
-            platform
-            suite
-            user
-            secrets
-            ; # Inherit variables.
-        };
-
-        modules =
-          [
-            nixvim.nixosModules.nixvim
-            ./suites/common.nix
-            ./suites/${suite}.nix
-            ./hosts/${hostname}.nix
-          ]
-          ++ (filesystem.listFilesRecursive ./modules)
-          ++ extraModules;
-      };
-    }
-    // optionalAttrs ((suite == "server")
-      || (suite == "vm")
-      || (suite == "lxc")) {
-      deploy.nodes.${hostname} = {
-        hostname = "${hostname}.local";
-        profiles.system = {
-          user = "root";
-          sshUser = user;
-          path = deployPkgs.deploy-rs.lib.activate.nixos self.nixosConfigurations.${hostname};
-        };
-      };
-    };
-}
diff --git a/lib/default.nix b/lib/default.nix
new file mode 100644
index 0000000..168a77a
--- /dev/null
+++ b/lib/default.nix
@@ -0,0 +1,81 @@
+inputs:
+with inputs;
+with inputs.nixpkgs.lib; {
+  mergeHosts = lists.foldl' (
+    a: b: attrsets.recursiveUpdate a b
+  ) {};
+
+  mkHost = hostname: {
+    platform ? "x86_64-linux",
+    suite,
+    user ? "fern",
+    extraModules ? [],
+  }: let
+    system = platform;
+    secrets = builtins.toString inputs.secrets;
+
+    pkgs = import nixpkgs {
+      inherit system;
+      config = {
+        allowUnfree = true;
+        permittedInsecurePackages = [
+          "dotnet-sdk-6.0.428"
+          "dotnet-runtime-6.0.36"
+        ];
+      };
+      overlays = [
+        (import ../overlays {inherit inputs system;})
+      ];
+    };
+
+    deployPkgs = import nixpkgs {
+      inherit system;
+      overlays = [
+        deploy-rs.overlays.default
+        (self: super: {
+          deploy-rs = {
+            inherit (pkgs) deploy-rs;
+            lib = super.deploy-rs.lib;
+          };
+        })
+      ];
+    };
+  in
+    {
+      nixosConfigurations.${hostname} = nixosSystem {
+        inherit system pkgs;
+
+        specialArgs = {
+          inherit
+            hostname
+            platform
+            suite
+            user
+            secrets
+            ; # Inherit variables.
+        };
+
+        modules =
+          [
+            nixvim.nixosModules.nixvim
+            ../suites/common.nix
+            ../suites/${suite}.nix
+            ../hosts/${hostname}.nix
+          ]
+          ++ (filesystem.listFilesRecursive ../modules)
+          ++ extraModules;
+      };
+    }
+    // optionalAttrs ((suite == "server")
+      || (suite == "vm")
+      || (suite == "lxc")) {
+      deploy.nodes.${hostname} = {
+        hostname = "${hostname}.local";
+        profiles.system = {
+          user = "root";
+          sshUser = user;
+          path = deployPkgs.deploy-rs.lib.activate.nixos self.nixosConfigurations.${hostname};
+        };
+      };
+    };
+}
diff --git a/overlays/default.nix b/overlays/default.nix
new file mode 100644
index 0000000..025b179
--- /dev/null
+++ b/overlays/default.nix
@@ -0,0 +1,62 @@
+{
+  inputs,
+  system,
+  ...
+}:
+with inputs;
+  final: prev: {
+    # WebOne HTTP proxy.
+    webone = prev.pkgs.callPackage ../packages/webone {};
+
+    # Yazi Gruvbox theme.
+    yazi-flavour-gruvbox-dark = prev.pkgs.callPackage ../packages/yazi-flavour-gruvbox {};
+
+    # Latest FluffyChat.
+    fluffychat =
+      (import nixpkgs-pr-fluffychat
+        {
+          inherit system;
+          overlays = [
+            (final: prev: {
+              fluffychat = prev.fluffychat.overrideAttrs (prevAttrs: {
+                desktopItems = [
+                  ((builtins.elemAt prevAttrs.desktopItems 0).override {startupWMClass = "fluffychat";})
+                ];
+              });
+            })
+          ];
+        }).fluffychat;
+
+    # Latest Feishin.
+    feishin =
+      (import nixpkgs-pr-feishin {
+        inherit system;
+        overlays = [
+          (final: prev: {
+            feishin = prev.feishin.overrideAttrs (prevAttrs: rec {
+              pname = "feishin";
+              version = "0.18.0";
+
+              src = prev.fetchFromGitHub {
+                owner = "jeffvli";
+                repo = "feishin";
+                rev = "v${version}";
+                hash = "sha256-4gcS7Vd7LSpEByO2Hlk6nb8V2adBPh5XwWGCu2lwOA4=";
+              };
+
+              pnpmDeps = prev.pnpm_10.fetchDeps {
+                inherit pname version src;
+                hash = "sha256-1MGxrUcfvazxAubaYAsQuulUKm05opWOIC7oaLzjr7o=";
+              };
+            });
+          })
+        ];
+      }).feishin;
+
+    # PrismLauncher with Temurin JRE;
+    prismlauncher = prev.prismlauncher.override {
+      jdks = [
+        prev.pkgs.temurin-jre-bin
+      ];
+    };
+  }