Magnus is an incubus and the primary antagonist in the audio drama Castlevania: Nocturne of Recollection, which takes place one year after Castlevania: Symphony of the Night. He tries to convince Maria Renard that Alucard is evil, and torments the dhamphir in the meantime.
He is also responsible for the "Dangerous Potion" that Cyril has.
An incubus who takes pleasure in the torture of innocent humans. He plans to resurrect Dracula's Castle and make Alucard its new lord.
The name "Magnus" means "Great".