|In-game Character Portrait|
|First appearance:||Lunar Knights|
|Voice actor:||Eric Kelso|
Dumas is one of the final bosses in the game, revered as the leader of the vampires. Prior to the events of Lunar Knights, he killed Trinity, Aaron's father, as well as Lucian's beloved, Ellen. After being defeated by Lucian and Aaron, he is seemingly absorbed by Polidori, but according to Lucian, he helps defeat Polidori in the endgame--for which Lucian states he will have revenge.