diff --git a/flake.nix b/flake.nix
index c5973b5c..04e018dd 100644
--- a/flake.nix
+++ b/flake.nix
@@ -309,26 +309,13 @@
           system = "armv6l-linux";
         };
 
-        yggdrasil = nixosSystem' {
-          modules = [
-            ./hosts/containers/yggdrasil
-            ./lib/lxc-container.nix
-            ./lib/users/emery.nix
-            (_: {
-              nixpkgs.overlays = [ secrets.overlays.ospf ];
-            })
-          ];
-        };
-
         matemat = nixosSystem' {
           modules = [
             ./lib/lxc-container.nix
             ./hosts/containers/matemat
             yammat.nixosModule
             secrets.nixosModules.admins
-            (_: {
-              nixpkgs.overlays = [ secrets.overlays.matemat ];
-            })
+            { nixpkgs.overlays = [ secrets.overlays.matemat ]; }
           ];
         };
 
diff --git a/host-registry.nix b/host-registry.nix
index 6f4c8c57..26df3f4a 100644
--- a/host-registry.nix
+++ b/host-registry.nix
@@ -67,13 +67,6 @@ rec {
       publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHhcvlbZ4TjAb6eQkYB2/Z3o/PHQVyAS6iEdGX+CEbGD";
     };
 
-    yggdrasil = {
-      ip4 = "172.20.72.62";
-      ip6 = "2a00:8180:2c00:281:9000::1";
-      ygg = "201:4561:bb58:4dac:5f6a:7b23:44f:a5ef";
-      publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHDmEymILp4IACjCbtMXx6eKPuTZHKyPUfAev05Gn7hi";
-    };
-
     freifunk = {
       ip4 = "172.20.72.40";
       publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMFbxHGfBMBjjior1FNRub56O62K++HVnqUH67BeKD7d";
diff --git a/hosts/containers/yggdrasil/default.nix b/hosts/containers/yggdrasil/default.nix
deleted file mode 100644
index 1c30d28c..00000000
--- a/hosts/containers/yggdrasil/default.nix
+++ /dev/null
@@ -1,157 +0,0 @@
-{ pkgs, lib, config, hostRegistry, zentralwerk, ... }:
-
-let
-  host = hostRegistry.hosts.yggdrasil;
-  yggAddress = host.ygg;
-  yggPrefix = "301:4561:bb58:4dac"; # 301:4561:bb58:4dac::/64
-  # taken from the output of "yggdrasilctl getself".
-  port = 46823;
-in {
-
-  boot.kernel.sysctl."net.ipv6.conf.all.forwarding" = 1;
-  # Forward traffic under the prefix.
-
-  boot.postBootCommands = ''
-    if [ ! -c /dev/net/tun ]; then
-      mkdir -p /dev/net
-      mknod -m 666 /dev/net/tun c 10 200
-    fi
-  '';
-
-  c3d2 = { isInHq = true; };
-
-  networking = let
-    inherit (zentralwerk.lib.config.site.net) core;
-  in {
-    hostName = "yggdrasil";
-    firewall.enable = false;
-    nat = {
-      enable = true;
-      # Provide routing for the house
-      extraCommands = ''
-        ip6tables -t nat -A POSTROUTING ! --src 200::/7 -o ygg -j MASQUERADE
-      '';
-    };
-    defaultGateway = core.hosts4.upstream4;
-    defaultGateway6 = core.hosts6.up4.upstream4;
-    # systemd-networkd breaks setting default routes. so sad.
-    useNetworkd = pkgs.lib.mkForce false;
-    nameservers = [ "172.20.73.8" ];
-    interfaces.core = {
-      mtu = 1500;
-      ipv4 = {
-        addresses = [{
-          address = host.ip4;
-          prefixLength = core.subnet4Len;
-        }];
-      };
-      ipv6 = {
-        addresses = [
-          {
-            address = host.ip6;
-            prefixLength = 64;
-          }
-        ];
-      };
-    };
-    interfaces.c3d2 = lib.mkForce {
-      ipv6 = {
-        addresses = [
-          {
-            address = yggPrefix + "::1";
-            prefixLength = 64;
-          }
-        ];
-      };
-    };
-  };
-
-  services.yggdrasil = {
-    enable = true;
-    persistentKeys = true;
-    config = {
-      IfName = "ygg";
-      Listen = [
-        "tcp://[::]:${toString port}"
-      ];
-      Peers = [
-        # deutschland
-        "tcp://45.11.19.26:5001"
-
-        # czechia
-        "tcp://[2a03:3b40:fe:ab::1]:46370"
-        "tcp://[2a05:9403::8b]:7743"
-
-        # polen
-        "tcp://[2001:41d0:601:1100::cf2]:37145"
-      ];
-      NodeInfo = {
-        # This information is visible to the network.
-        name = "y.c3d2.de";
-        location = "Dresden";
-        email = "ehmry@c3d2.de";
-      };
-    };
-  };
-
-  # Get routes on the core network, advertise Yggdrasil routes to ZW core
-  services.bird2 = {
-    enable = true;
-    config = ''
-      protocol kernel K4 {
-        ipv4 {
-          export all;
-        };
-      }
-      protocol kernel K6 {
-        ipv6 {
-          export all;
-        };
-      }
-      protocol device {
-        scan time 10;
-      }
-
-      # protocol radv {
-      #   interface "c3d2" {
-      #     min ra interval 10;
-      #     max ra interval 60;
-      #     prefix ${yggPrefix}/64 {
-      #       preferred lifetime 20;
-      #       valid lifetime 60;
-      #     };
-      #   };
-      # }
-
-      protocol ospf v2 ZW4 {
-        area 0 {
-          interface "core" {
-            authentication cryptographic;
-            password "${pkgs.zentralwerk-ospf-message-digest-key}";
-          };
-        };
-      }
-
-      protocol ospf v3 ZW6 {
-        area 0 {
-          stubnet 200::/7 {};
-          interface "core" {
-            authentication cryptographic;
-            password "${pkgs.zentralwerk-ospf-message-digest-key}";
-          };
-        };
-      }
-
-      router id ${host.ip4};
-    '';
-  };
-
-  services.nginx = {
-    enable = true;
-    virtualHosts."y.c3d2.de" = {
-      default = true;
-      locations."/".proxyPass = "https://c3d2.de";
-    };
-  };
-
-}