The Master of Evil is a secret boss in Sonata of Blood, accessed from the Grand Palace, in a room behind a cracked golden clock.
At first, a large cape will be seen. A wind passes by, blowing off the cape and revealing...a puffin standing on a box. It has absolutely no attacks, and only 1 HP. It is the easiest enemy and boss in the game. Also, it drops a Potion Ex and gives a very large amount of experience.