diff --git a/src/main/resources/bios.js b/src/main/resources/bios.js
index 7fadf61..fb9a77c 100644
--- a/src/main/resources/bios.js
+++ b/src/main/resources/bios.js
@@ -17,9 +17,12 @@ var global = this;
             global.debug = true;
         }
         if (java.nio.file.Files.exists(java.nio.file.Paths.get(root, "debug"))) {
-            logger.info('Running debugging mode...');
+            logger.info('Running in debug mode...');
             global.debug = true;
-            global.trace = true;
+        }
+        if (java.nio.file.Files.exists(java.nio.file.Paths.get(root, "level"))) {
+            global.level = base.read(java.nio.file.Paths.get(root, "level"))
+            logger.info('Set system level to [' + global.level + ']...');
         }
         // Check Class Loader, Sometimes Server will can't find plugin.yml file
         loader = checkClassLoader();
diff --git a/src/main/resources/core/console.js b/src/main/resources/core/console.js
index d41d13b..6fbc862 100644
--- a/src/main/resources/core/console.js
+++ b/src/main/resources/core/console.js
@@ -1,19 +1,29 @@
-(function(logger) {
-    function log() {
-        logger.info(Array.prototype.join.call(arguments, ' '))
-    }
-    function _proxy(prefix) {
-        return function() {
-            log('[' + prefix + ']', Array.prototype.join.call(arguments, ' '))
+// @ts-check
+(
+    /**
+     * @param {{ info: (arg0: string) => void; }} logger
+     */
+    function(logger) {
+        function log() {
+            logger.info(Array.prototype.join.call(arguments, ' '))
         }
-    }
-    return {
-        log: log,
-        info: log,
-        ex: log,
-        trace: global.trace ? _proxy('TRACE') : global.noop,
-        debug: global.debug ? _proxy('DEBUG') : global.noop,
-        warn: _proxy('WARN'),
-        error: _proxy('ERROR')
-    };
-})
+        /**
+         * @param {string} prefix
+         */
+        function _proxy(prefix) {
+            return function() {
+                log('[' + prefix + ']', Array.prototype.join.call(arguments, ' '))
+            }
+        }
+        return {
+            log: log,
+            info: log,
+            ex: log,
+            // @ts-ignore
+            trace: global.level === "trace" ? _proxy('TRACE') : global.noop,
+            // @ts-ignore
+            debug: global.debug ? _proxy('DEBUG') : global.noop,
+            warn: _proxy('WARN'),
+            error: _proxy('ERROR')
+        };
+    })