diff --git a/src/index.ts b/src/index.ts
index e17adb92f..28bc9f3d4 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -25,8 +25,9 @@ import { Config } from './config/types';
 import { lessThan } from './prelude/array';
 import * as pkg from '../package.json';
 
-const bootLogger = new Logger('boot');
-const clusterLog = new Logger('cluster');
+const logger = new Logger('core');
+const bootLogger = new Logger('boot', logger);
+const clusterLog = new Logger('cluster', logger);
 const ev = new Xev();
 
 if (process.env.NODE_ENV != 'production' && process.env.DEBUG == null) {
@@ -86,7 +87,7 @@ async function masterMain() {
 		await spawnWorkers(config.clusterLimit);
 	}
 
-	bootLogger.succ(`Now listening on port ${config.port} on ${config.url}`);
+	bootLogger.succ(`Now listening on port ${config.port} on ${config.url}`, true);
 }
 
 /**
@@ -264,12 +265,12 @@ process.on('unhandledRejection', console.dir);
 
 // Display detail of uncaught exception
 process.on('uncaughtException', err => {
-	console.error(err);
+	logger.error(err);
 });
 
 // Dying away...
 process.on('exit', code => {
-	Logger.info(`The process is going to exit with code ${code}`);
+	logger.info(`The process is going to exit with code ${code}`);
 });
 
 //#endregion
diff --git a/src/misc/logger.ts b/src/misc/logger.ts
index 925d14d64..402660d97 100644
--- a/src/misc/logger.ts
+++ b/src/misc/logger.ts
@@ -10,41 +10,26 @@ export default class Logger {
 		this.parentLogger = parentLogger;
 	}
 
-	public log(level: string, message: string): void {
+	public log(level: string, message: string, important = false): void {
 		if (this.parentLogger) {
-			this.parentLogger.log(level, `[${this.domain}] ${message}`);
+			this.parentLogger.log(level, `[${this.domain}]\t${message}`, important);
 		} else {
 			const time = dateformat(new Date(), 'HH:MM:ss');
-			console.log(`${chalk.gray(time)} ${level} [${this.domain}] ${message}`);
+			const log = `${chalk.gray(time)} ${level} [${this.domain}]\t${message}`;
+			console.log(important ? chalk.bold(log) : log);
 		}
 	}
 
-	public static error(message: string): void {
-		(new Logger('')).error(message);
-	}
-
-	public static warn(message: string): void {
-		(new Logger('')).warn(message);
-	}
-
-	public static succ(message: string): void {
-		(new Logger('')).succ(message);
-	}
-
-	public static info(message: string): void {
-		(new Logger('')).info(message);
-	}
-
-	public error(message: string): void { // 実行を継続できない状況で使う
-		this.log(chalk.red.bold('ERROR'), chalk.red.bold(message));
+	public error(message: string | Error): void { // 実行を継続できない状況で使う
+		this.log(chalk.red.bold('ERROR'), chalk.red.bold(message.toString()));
 	}
 
 	public warn(message: string): void {　// 実行を継続できるが改善すべき状況で使う
 		this.log(chalk.yellow.bold('WARN'), chalk.yellow.bold(message));
 	}
 
-	public succ(message: string): void { // 何かに成功した状況で使う
-		this.log(chalk.blue.green('DONE'), chalk.green.bold(message));
+	public succ(message: string, important = false): void { // 何かに成功した状況で使う
+		this.log(chalk.blue.green('DONE'), chalk.green.bold(message), important);
 	}
 
 	public info(message: string): void { // それ以外