diff --git a/helpers.nix b/helpers.nix
index 73616be..50a8fda 100644
--- a/helpers.nix
+++ b/helpers.nix
@@ -12,64 +12,9 @@ with inputs.nixpkgs.lib; {
     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 = {
@@ -79,12 +24,9 @@ with inputs.nixpkgs.lib; {
           "dotnet-runtime-6.0.36"
         ];
       };
-      overlays = [
-        userPackages
-      ];
     };
 
-    deployPkgs = import nixpkgs {
+    pkgs-deploy-rs = import nixpkgs {
       inherit system;
       overlays = [
         deploy-rs.overlays.default
@@ -96,6 +38,13 @@ with inputs.nixpkgs.lib; {
         })
       ];
     };
+
+    userPackages = {
+      fluffychat = (import nixpkgs-pr-fluffychat {inherit system;}).fluffychat;
+      feishin = (import nixpkgs-pr-feishin {inherit system;}).feishin;
+      webone = pkgs.callPackage ./packages/webone {};
+      yazi-flavour-gruvbox-dark = pkgs.callPackage ./packages/yazi-flavour-gruvbox {};
+    };
   in
     {
       nixosConfigurations.${hostname} = nixosSystem {
@@ -103,11 +52,13 @@ with inputs.nixpkgs.lib; {
 
         specialArgs = {
           inherit
+            nixpkgs
             hostname
             platform
             suite
             user
             secrets
+            userPackages
             ; # Inherit variables.
         };
 
@@ -122,15 +73,13 @@ with inputs.nixpkgs.lib; {
           ++ extraModules;
       };
     }
-    // optionalAttrs ((suite == "server")
-      || (suite == "vm")
-      || (suite == "lxc")) {
+    // optionalAttrs (suite != "desktop") {
       deploy.nodes.${hostname} = {
         hostname = "${hostname}.local";
         profiles.system = {
           user = "root";
           sshUser = user;
-          path = deployPkgs.deploy-rs.lib.activate.nixos self.nixosConfigurations.${hostname};
+          path = pkgs-deploy-rs.deploy-rs.lib.activate.nixos self.nixosConfigurations.${hostname};
         };
       };
     };
diff --git a/hosts/weebill.nix b/hosts/weebill.nix
index 1f29ef0..0e32e56 100644
--- a/hosts/weebill.nix
+++ b/hosts/weebill.nix
@@ -42,7 +42,6 @@
       };
     };
   };
-
   # Open ports for services.
   networking.firewall = {
     allowedUDPPorts = [
diff --git a/modules/webone.nix b/modules/webone.nix
index dc8169d..701374a 100644
--- a/modules/webone.nix
+++ b/modules/webone.nix
@@ -1,7 +1,7 @@
 {
   config,
   lib,
-  pkgs,
+  userPackages,
   ...
 }:
 with lib; let
@@ -47,13 +47,13 @@ in {
       startLimitIntervalSec = 5;
       startLimitBurst = 3;
       environment = {
-        OPENSSL_CONF = "${pkgs.webone}/lib/webone/openssl_webone.cnf";
+        OPENSSL_CONF = "${userPackages.webone}/lib/webone/openssl_webone.cnf";
       };
       serviceConfig = {
         Type = "simple";
         User = "webone";
         Group = "webone";
-        ExecStart = "${pkgs.webone}/bin/webone";
+        ExecStart = "${userPackages.webone}/bin/webone";
         TimeoutStopSec = "10";
         Restart = "on-failure";
         RestartSec = "5";
diff --git a/overlay.nix b/overlay.nix
deleted file mode 100644
index 1d29e14..0000000
--- a/overlay.nix
+++ /dev/null
@@ -1,43 +0,0 @@
-inputs:
-with inputs; (super: self: {
-  webone = super.pkgs.callPackage ./packages/webone {};
-  yazi-flavour-gruvbox-dark = super.pkgs.callPackage ./packages/yazi-flavour-gruvbox {};
-  pr.fluffychat = import nixpikgs-pr-fluffychat {inherit system;};
-
-  pr.feishin = import nixpkgs-pr-feishin {
-    inherit system;
-    overlays = [
-      (self: super: {
-        feishin = super.feishin.overrideAttrs (old: rec {
-          pname = "feishin";
-          version = "0.18.0";
-
-          src = super.fetchFromGitHub {
-            owner = "jeffvli";
-            repo = "feishin";
-            rev = "v${version}";
-            hash = "sha256-4gcS7Vd7LSpEByO2Hlk6nb8V2adBPh5XwWGCu2lwOA4=";
-          };
-
-          pnpmDeps = super.pnpm_10.fetchDeps {
-            inherit pname version src;
-            hash = "sha256-1MGxrUcfvazxAubaYAsQuulUKm05opWOIC7oaLzjr7o=";
-          };
-        });
-      })
-    ];
-  };
-
-  deploy-rs = import nixpkgs {
-    inherit system;
-    overlays = [
-      deploy-rs.overlays.default
-      (self: super: {
-        deploy-rs = {
-          inherit (pkgs) deploy-rs;
-          lib = super.deploy-rs.lib;
-        };
-      })
-    ];
-  };
-})
diff --git a/suites/common.nix b/suites/common.nix
index 0f3a929..56cce29 100644
--- a/suites/common.nix
+++ b/suites/common.nix
@@ -1,4 +1,6 @@
 {
+  nixpkgs,
+  userPackages,
   pkgs,
   lib,
   hostname,
@@ -18,6 +20,9 @@ with lib; {
   # Add @wheel to trusted-users for remote deployments.
   nix.settings.trusted-users = ["root" "@wheel"];
 
+  # Set $NIX_PATH to flake input.
+  nix.nixPath = ["nixpkgs=${nixpkgs}"];
+
   # Enable redistributable firmware.
   hardware.enableRedistributableFirmware = true;
 
@@ -72,7 +77,7 @@ with lib; {
       # yazi cd on quit.
       function y
         set tmp (mktemp -t "yazi-cwd.XXXXXX")
-        yazi $argv --cwd-file="$tmp"
+        ${pkgs.yazi}/bin/yazi $argv --cwd-file="$tmp"
         if read -z cwd < "$tmp"; and [ -n "$cwd" ]; and [ "$cwd" != "$PWD" ]
           builtin cd -- "$cwd"
         end
@@ -84,10 +89,10 @@ with lib; {
   # https://nixos.wiki/wiki/Fish#Setting_fish_as_your_shell
   programs.bash = {
     interactiveShellInit = ''
-      if [[ $(ps --no-header --pid=$PPID --format=comm) != "fish" && -z ''${BASH_EXECUTION_STRING} ]]
+      if [[ $(${pkgs.procps}/bin/ps --no-header --pid=$PPID --format=comm) != "fish" && -z ''${BASH_EXECUTION_STRING} ]]
       then
         shopt -q login_shell && LOGIN_OPTION='--login' || LOGIN_OPTION=""
-        exec fish $LOGIN_OPTION
+        exec ${pkgs.fish}/bin/fish $LOGIN_OPTION
       fi
     '';
   };
@@ -102,26 +107,19 @@ with lib; {
 
     nixvim = {
       enable = true;
-      defaultEditor = true;
 
-      # For telescope.
       dependencies.ripgrep.enable = true;
 
-      # Space as leader.
       globals.mapleader = " ";
 
       keymaps = [
         {
-          key = "<Leader>t";
+          key = "<Leader>tt";
           action = "<cmd> ToggleTerm direction=float <CR>";
         }
         {
-          key = "<Leader>x";
-          action = "<cmd> Trouble diagnostics toggle focus=false <CR>";
-        }
-        {
-          key = "<Leader>y";
-          action = "<cmd> Yazi <CR>";
+          key = "<Leader>xx";
+          action = "<cmd> Trouble diagnostics toggle focus=false<CR>";
         }
       ];
 
@@ -153,7 +151,6 @@ with lib; {
         toggleterm.enable = true;
         trouble.enable = true;
         web-devicons.enable = true;
-        yazi.enable = true;
 
         lualine = {
           enable = true;
@@ -224,7 +221,7 @@ with lib; {
 
   programs.yazi = {
     enable = true;
-    flavors."gruvbox-dark.yazi" = pkgs.yazi-flavour-gruvbox-dark;
+    flavors."gruvbox-dark.yazi" = userPackages.yazi-flavour-gruvbox-dark;
     settings.theme = {
       flavor.dark = "gruvbox-dark";
     };
diff --git a/suites/desktop.nix b/suites/desktop.nix
index 2c7942d..813f2d5 100755
--- a/suites/desktop.nix
+++ b/suites/desktop.nix
@@ -1,5 +1,6 @@
 {
   pkgs,
+  userPackages,
   lib,
   ...
 }:
@@ -47,8 +48,8 @@ with lib; {
   services.xserver = {
     enable = true;
 
-    excludePackages = [
-      pkgs.xterm # Don't install xterm.
+    excludePackages = with pkgs; [
+      xterm # Don't install xterm.
     ];
 
     displayManager.gdm.enable = true;
@@ -104,8 +105,6 @@ with lib; {
     celluloid
     deploy-rs
     discord
-    feishin
-    fluffychat
     ghostty
     gimp3
     glabels-qt
@@ -119,12 +118,27 @@ with lib; {
     merriweather-sans
     nerd-fonts.fira-code
     obsidian
-    prismlauncher
-    prismlauncher
     protonmail-desktop
     signal-desktop
     smile
+    userPackages.feishin
     yubioath-flutter
+
+    # PrismLauncher with temurin jre.
+    (prismlauncher.override {
+      jdks = [
+        temurin-jre-bin
+      ];
+    })
+
+    # FluffyChat 2.0.0 with fixed desktop item.
+    (userPackages.fluffychat.overrideAttrs (
+      finalAttrs: previousAttrs: {
+        desktopItems = [
+          ((builtins.elemAt previousAttrs.desktopItems 0).override {startupWMClass = "fluffychat";})
+        ];
+      }
+    ))
   ];
 
   # Allow opening terminal applications from gnome app launcher.
diff --git a/suites/server.nix b/suites/server.nix
index bf2df0c..e3adcde 100644
--- a/suites/server.nix
+++ b/suites/server.nix
@@ -23,6 +23,8 @@ with lib; {
   users.users.${user} = {
     openssh.authorizedKeys.keys = [
       "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIETPyuxUVEmYyEW6PVC6BXqkhULHd/RvMm8fMbYhjTMV fern@muskduck"
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIKzW4epTmK01kGVXcuAXUNJQPltnogf4uab9FA5m8S3n fern@pardalote"
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBEJYq1fMxVOzCMfE/td6DtWS8nUk76U9seYD3Z9RYAz u0_a399@fairywren"
       "sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIMoJvPcUJDVVzO4dHROCFNlgJdDZSP5xyPx2s40zcx5QAAAABHNzaDo= YubiKey5NFC"
     ];
     extraGroups = mkIf (user == "docker") ["docker"]; # if docker is enabled.