The Roaring Knight is the main antagonist of Deltarune. It serves as the "unbeatable" final boss and bonus boss of Chapter 3, and as the main antagonist of Chapter 4. King and Queen both align themselves with the Knight after it created their Dark Fountains. As demonstrated in Chapters 3 and 4, the Knight boasts tremendous power, and has the ability to open Dark Fountains and create Dark Worlds; a power held by all Lightners. Uses sword slashes and dark/star magic.