The Crimson Knight is the first boss of End of Days.
The Crimson Knight at first slowly walks around the room, tossing daggers. However, when the player gets close to him, he will dash at them with surprising speed. He can do this throughout the entire battle after this point, so going near him is not advised. Later, he can throw axes, and bone crosses. He has 2000 HP, and his theme is Resonance of Malevolent Souls.