Death Knight

"I have a talent for murder that demands expression. How dare you constrict me? Know that my truest, deepest wish is to engage you in a mortal duel... and, in that duel, to die by your hand. You are capable of ending my life, are you not? I eagerly await that day. Meanwhile, I will sharpen my scythe and slay any weakling foolish enough to cross me."

- Death Knight to the Summoner in Fire Emblem Heroes "Mer...ce...des..."

- The Death Knight's last words while dying in Mercedes' arms (scene unlockable in Azure Moon only)

The Death Knight, also known as the Reaper in Fire Emblem Heroes, is the second-in-command of the Flame Emperor's Army and a major antagonist of Fire Emblem: Three Houses. He is also the personal rival of Byleth and Caspar.

As the story progressed, his secret identity is first revealed to be Jeritza von Hrym, a teacher at the Officers Academy and a member of the Knights of Seiros. However, in a post-timeskip paralogue that requires Mercedes and Caspar's recruitment, the Death Knight/Jeritza's true name is revealed to be Emile von Bartels, who is the younger half-brother of Mercedes von Martritz.

He is voiced by Atsushi Imaruoka in Japanese version and by Patrick Seitz in English version.

Trivia

 * The paralogue of Mercedes and Caspar, that revealed the true secret idenity of Death Knight, cannot be unlocked in Crimson Flower chapter due to him becoming an ally to Byleth and is only mentioned by this point of the main story.
 * His English voice actor, Patrick Seitz, is the English voice director of Fire Emblem: Three Houses and also voiced King Lambert Egitte Blaiddyd in the same game.
 * To keep his true identity secret in Fire Emblem Heroes, the name of the Death Knight's voice actors (in both versions) of the said spin-off remain uncredicted.
 * The Death Knight is essentially based upon the Black Knight from Fire Emblem: Awakening. They're both powerful opponents who must be avoided rather than fought as they can cut down the player's units with ease, they both develop a fixation on the child of a legendary mercenary as a worthy opponent, and they're both protectors to a white-haired female lord.
 * The Death Knight made his first playable debut in Fire Emblem Heroes, whereas his Jeritza persona would be playable in the third pack of DLC in Fire Emblem: Three Heroes.