diff --git a/common/common-packages.nix b/common/common-packages.nix
new file mode 100644
index 0000000..2568b65
--- /dev/null
+++ b/common/common-packages.nix
@@ -0,0 +1,71 @@
+{ pkgs, lib, config, ... }: {
+
+
+  environment.systemPackages = with pkgs; [
+    vim
+    wget
+    git
+    git-lfs
+    gnumake
+    zip
+    fish
+    trash-cli
+    tmux
+    zoxide
+    htop
+    unzip
+    tlrc
+    wakeonlan
+    neovim
+    pkgs-unstable.ani-cli
+    btop
+    pciutils
+    nodePackages.npm
+    nodejs
+    cloc
+    neofetch
+    cbonsai
+    cowsay
+    fortune
+    lolcat
+    cmatrix
+    inxi
+    age
+    sops
+    jq
+    onefetch
+    just
+    gh
+    starship
+    tree
+    ffmpeg
+  ];
+
+  programs.steam = {
+    enable = true;
+    # Open ports in the firewall for Steam Remote Play
+    remotePlay.openFirewall = true;
+    # Open ports in the firewall for Source Dedicated Server
+    dedicatedServer.openFirewall = true;
+    # Open ports in the firewall for Steam Local Network Game Transfers
+    localNetworkGameTransfers.openFirewall = true;
+  };
+
+  programs.gnupg.agent = {
+    enable = true;
+    enableSSHSupport = true;
+  };
+
+  programs.direnv = {
+    enable = true;
+    package = pkgs.direnv;
+    silent = false;
+    loadInNixShell = true;
+    direnvrcExtra = "";
+    nix-direnv = {
+      enable = true;
+      package = pkgs.nix-direnv;
+    };
+  };
+
+}
diff --git a/common/firefox.nix b/common/firefox.nix
new file mode 100644
index 0000000..b6b90ce
--- /dev/null
+++ b/common/firefox.nix
@@ -0,0 +1,37 @@
+{ pkgs, lib, config, ... }: {
+
+  # Install firefox.
+  programs.firefox = {
+    enable = true;
+    languagePacks = [ "ja" "tr" "en-US" ];
+
+    # profiles.osbm = {
+
+
+    # Check about:policies#documentation for options.
+    policies = {
+      DisableTelemetry = true;
+      DisableFirefoxStudies = true;
+      EnableTrackingProtection = {
+        Value= true;
+        Locked = true;
+        Cryptomining = true;
+        Fingerprinting = true;
+      };
+      # DisablePocket = true;
+      DisableFirefoxAccounts = true;
+      DisableAccounts = true;
+      DisableFirefoxScreenshots = true;
+      StartPage = "previous-session";
+      # OverrideFirstRunPage = "";
+      # OverridePostUpdatePage = "";
+      # DontCheckDefaultBrowser = true;
+      DisplayBookmarksToolbar = "always"; # alternatives: "never" or "newtab"
+      # DisplayMenuBar = "default-off"; # alternatives: "always", "never" or "default-on"
+      # SearchBar = "unified"; # alternat
+    };
+  };
+
+
+
+}
diff --git a/flake.nix b/flake.nix
index 112d25f..b45b573 100644
--- a/flake.nix
+++ b/flake.nix
@@ -48,6 +48,22 @@
             system-label = self.shortRev or self.dirtyShortRev or self.lastModified or "unknown";
           };
         };
+        ymir = nixpkgs.lib.nixosSystem rec {
+          system = "x86_64-linux";
+          modules = [
+            ./hosts/ymir/configuration.nix
+            vscode-server.nixosModules.default
+            sops-nix.nixosModules.sops
+            # stylix.nixosModules.stylix
+          ];
+          specialArgs = {
+            pkgs-unstable = import nixpkgs-unstable {
+              inherit system;
+              config.allowUnfree = true;
+            };
+            system-label = self.shortRev or self.dirtyShortRev or self.lastModified or "unknown";
+          };
+        };
       };
     };
 }
diff --git a/hosts/tartarus/configuration.nix b/hosts/tartarus/configuration.nix
index 7845bc3..ac4d9fd 100644
--- a/hosts/tartarus/configuration.nix
+++ b/hosts/tartarus/configuration.nix
@@ -1,6 +1,7 @@
 # Edit this configuration file to define what should be installed on
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running ‘nixos-help’).
+
 { config, pkgs, pkgs-unstable, system-label, ... }:
 
 {
@@ -11,6 +12,8 @@
     ../../common/i18n.nix
     ../../common/python.nix
     ../../common/arduino.nix
+    ../../common/firefox.nix
+    ../../common/common-packages.nix
   ];
 
   # stylix.enable = true;
@@ -73,17 +76,7 @@
     pulse.enable = true;
   };
 
-  programs.direnv = {
-    enable = true;
-    package = pkgs.direnv;
-    silent = false;
-    loadInNixShell = true;
-    direnvrcExtra = "";
-    nix-direnv = {
-      enable = true;
-      package = pkgs.nix-direnv;
-    };
-  };
+
 
   # Enable touchpad support (enabled default in most desktopManager).
   # services.xserver.libinput.enable = true;
@@ -112,95 +105,15 @@
     ];
   };
 
-  # Install firefox.
-  programs.firefox = {
-    enable = true;
-    languagePacks = [ "ja" "tr" "en-US" ];
 
-    # profiles.osbm = {
-
-
-    # Check about:policies#documentation for options.
-    policies = {
-      DisableTelemetry = true;
-      DisableFirefoxStudies = true;
-      EnableTrackingProtection = {
-        Value= true;
-        Locked = true;
-        Cryptomining = true;
-        Fingerprinting = true;
-      };
-      # DisablePocket = true;
-      DisableFirefoxAccounts = true;
-      DisableAccounts = true;
-      DisableFirefoxScreenshots = true;
-      StartPage = "previous-session";
-      # OverrideFirstRunPage = "";
-      # OverridePostUpdatePage = "";
-      # DontCheckDefaultBrowser = true;
-      DisplayBookmarksToolbar = "always"; # alternatives: "never" or "newtab"
-      # DisplayMenuBar = "default-off"; # alternatives: "always", "never" or "default-on"
-      # SearchBar = "unified"; # alternat
-    };
-  };
-
-  programs.steam = {
-    enable = true;
-    # Open ports in the firewall for Steam Remote Play
-    remotePlay.openFirewall = true;
-    # Open ports in the firewall for Source Dedicated Server
-    dedicatedServer.openFirewall = true;
-    # Open ports in the firewall for Steam Local Network Game Transfers
-    localNetworkGameTransfers.openFirewall = true;
-  };
 
   environment.systemPackages = with pkgs; [
-    vim
-    wget
-    git
-    git-lfs
-    gnumake
-    zip
-    fish
-    trash-cli
-    tmux
-    zoxide
-    htop
-    unzip
-    tlrc
-    wakeonlan
-    neovim
-    pkgs-unstable.ani-cli
-    btop
-    pciutils
-    nodePackages.npm
-    nodejs
-    cloc
-    neofetch
-    cbonsai
-    cowsay
-    fortune
-    lolcat
-    cmatrix
-    inxi
-    age
-    sops
-    jq
-    onefetch
-    just
-    gh
-    starship
-    tree
-    ffmpeg
   ];
 
   # Some programs need SUID wrappers, can be configured further or are
   # started in user sessions.
   # programs.mtr.enable = true;
-  programs.gnupg.agent = {
-    enable = true;
-    enableSSHSupport = true;
-  };
+
 
   # List services that you want to enable:
 
diff --git a/hosts/ymir/configuration.nix b/hosts/ymir/configuration.nix
new file mode 100644
index 0000000..1d1e279
--- /dev/null
+++ b/hosts/ymir/configuration.nix
@@ -0,0 +1,170 @@
+# Edit this configuration file to define what should be installed on
+# your system.  Help is available in the configuration.nix(5) man page
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+
+{ config, pkgs, pkgs-unstable, system-label, ... }:
+
+{
+  imports = [
+    ./hardware-configuration.nix
+    ../../common/fonts.nix
+    ../../common/nix-settings.nix
+    ../../common/i18n.nix
+    ../../common/python.nix
+    ../../common/arduino.nix
+    ../../common/firefox.nix
+    ../../common/common-packages.nix
+  ];
+
+  # Bootloader.
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  boot.initrd.luks.devices."luks-b84e6223-825f-4944-a6fe-16368b75c6de".device = "/dev/disk/by-uuid/b84e6223-825f-4944-a6fe-16368b75c6de";
+  networking.hostName = "ymir"; # Define your hostname.
+  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
+
+  # Configure network proxy if necessary
+  # networking.proxy.default = "http://user:password@proxy:port/";
+  # networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";
+
+  # Enable networking
+  networking.networkmanager.enable = true;
+
+
+  # hardware.nvidia.package = config.boot.kernelPackages.nvidiaPackages.stable;
+  # Enable OpenGL
+  hardware.graphics = {
+    enable = true;
+  };
+
+  # Load nvidia driver for Xorg and Wayland
+  services.xserver.videoDrivers = ["nvidia"];
+
+  hardware.nvidia = {
+
+    # Modesetting is required.
+    modesetting.enable = true;
+
+    # Nvidia power management. Experimental, and can cause sleep/suspend to fail.
+    # Enable this if you have graphical corruption issues or application crashes after waking
+    # up from sleep. This fixes it by saving the entire VRAM memory to /tmp/ instead
+    # of just the bare essentials.
+    powerManagement.enable = false;
+
+    # Fine-grained power management. Turns off GPU when not in use.
+    # Experimental and only works on modern Nvidia GPUs (Turing or newer).
+    powerManagement.finegrained = false;
+
+    # Use the NVidia open source kernel module (not to be confused with the
+    # independent third-party "nouveau" open source driver).
+    # Support is limited to the Turing and later architectures. Full list of
+    # supported GPUs is at:
+    # https://github.com/NVIDIA/open-gpu-kernel-modules#compatible-gpus
+    # Only available from driver 515.43.04+
+    # Currently alpha-quality/buggy, so false is currently the recommended setting.
+    open = false;
+
+    # Enable the Nvidia settings menu,
+	# accessible via `nvidia-settings`.
+    nvidiaSettings = true;
+
+    # Optionally, you may need to select the appropriate driver version for your specific GPU.
+    package = config.boot.kernelPackages.nvidiaPackages.stable;
+  };
+
+
+  # Enable the X11 windowing system.
+  # You can disable this if you're only using the Wayland session.
+  services.xserver.enable = true;
+
+  # Enable the KDE Plasma Desktop Environment.
+  services.displayManager.sddm.enable = true;
+  services.desktopManager.plasma6.enable = true;
+
+  # Enable CUPS to print documents.
+  services.printing.enable = true;
+
+  # Enable sound with pipewire.
+  hardware.pulseaudio.enable = false;
+  security.rtkit.enable = true;
+  services.pipewire = {
+    enable = true;
+    alsa.enable = true;
+    alsa.support32Bit = true;
+    pulse.enable = true;
+    # If you want to use JACK applications, uncomment this
+    #jack.enable = true;
+
+    # use the example session manager (no others are packaged yet so this is enabled by default,
+    # no need to redefine it in your config for now)
+    #media-session.enable = true;
+  };
+
+  # Enable touchpad support (enabled default in most desktopManager).
+  # services.xserver.libinput.enable = true;
+
+  # Define a user account. Don't forget to set a password with ‘passwd’.
+  virtualisation.docker.enable = true;
+
+  users.users.osbm = {
+    isNormalUser = true;
+    description = "osbm";
+    extraGroups = [ "networkmanager" "wheel" "docker" ];
+    packages = with pkgs; [
+      kdePackages.kate
+      vscode
+      pkgs-unstable.discord # discord sucks
+      alacritty
+      pkgs-unstable.obsidian
+      mpv
+      libreoffice
+      blender
+      gimp
+      kitty
+      obs-studio
+      audacity
+      pkgs-unstable.qbittorrent
+      arduino-ide
+    ];
+  };
+
+
+
+  nixpkgs.config.allowUnfree = true;
+
+
+  # List packages installed in system profile. To search, run:
+  # $ nix search wget
+  environment.systemPackages = with pkgs; [
+  #  vim # Do not forget to add an editor to edit configuration.nix! The Nano editor is also installed by default.
+  ];
+
+  # Some programs need SUID wrappers, can be configured further or are
+  # started in user sessions.
+  # programs.mtr.enable = true;
+  # programs.gnupg.agent = {
+  #   enable = true;
+  #   enableSSHSupport = true;
+  # };
+
+  # List services that you want to enable:
+
+  # Enable the OpenSSH daemon.
+  services.openssh.enable = true;
+
+  # Open ports in the firewall.
+  # networking.firewall.allowedTCPPorts = [ ... ];
+  # networking.firewall.allowedUDPPorts = [ ... ];
+  # Or disable the firewall altogether.
+  # networking.firewall.enable = false;
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "24.11"; # Did you read the comment?
+
+}
diff --git a/hosts/ymir/hardware-configuration.nix b/hosts/ymir/hardware-configuration.nix
new file mode 100644
index 0000000..08a4429
--- /dev/null
+++ b/hosts/ymir/hardware-configuration.nix
@@ -0,0 +1,43 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/installer/scan/not-detected.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "xhci_pci" "ahci" "nvme" "usbhid" "usb_storage" "sd_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/bfbd04d5-49bb-4571-8897-d36b2c679a6c";
+      fsType = "ext4";
+    };
+
+  boot.initrd.luks.devices."luks-58144581-4049-4169-b8a9-4da19129416a".device = "/dev/disk/by-uuid/58144581-4049-4169-b8a9-4da19129416a";
+
+  fileSystems."/boot" =
+    { device = "/dev/disk/by-uuid/7F17-2E5B";
+      fsType = "vfat";
+      options = [ "fmask=0077" "dmask=0077" ];
+    };
+
+  swapDevices =
+    [ { device = "/dev/disk/by-uuid/a07d03b7-c2fb-40f9-89b0-d8f6db9d0e0e"; }
+    ];
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp3s0.useDHCP = lib.mkDefault true;
+  # networking.interfaces.wlo1.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}