A lot of things.

Service/Club/DeleterService.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace RomhackPlaza\Master\Service\Club;
+
+use RomhackPlaza\Master\Entity\Club;
+use XF\App;
+use XF\Entity\Forum;
+use XF\Entity\Node;
+use XF\Http\Upload;
+use XF\Service\AbstractService;
+use XF\Service\ValidateAndSavableTrait;
+use XF\Util\File;
+
+class DeleterService extends AbstractService
+{
+
+    /**
+     * @var Club
+     */
+    protected $club;
+
+    public function __construct(App $app, Club $club)
+    {
+        parent::__construct($app);
+
+        $this->club = $club;
+    }
+
+    public function delete()
+    {
+        if( $this->club->Forum && $this->club->Forum->Node ){
+            $this->club->Forum->Node->delete();
+        }
+
+        $path = 'data://club_banners/' . $this->club->club_id . '.jpg';
+        File::deleteFromAbstractedPath($path);
+
+        $this->club->delete();
+    }
+}