While gradually playing through Fire Emblem: Three Houses, it's become clear just how massive this game really is. What starts as an already bustling school-life sim twists on its head after the midway point, and the different houses branch off into very different routes.
There is a lot of content to miss, and one in particular is starting to come up, as it contains more info on one of the most enigmatic characters in Three Houses: the Death Knight.
The Death Knight appears fairly early on in the story as an agent of the mysterious group pulling the strings of Fodlan's politics. Though you it is heavily implied who the Death Knight is during the course of the game, you get a much greater—and more in-depth—explanation if you've recruited certain characters.
A user on the Fire Emblem subreddit captured a special scene that plays only if you've recruited Mercedes and Caspar, completed a certain paralogue, and are on the right route. (Some folks are saying it's exclusive to the Blue Lions, while other users say they've encountered it on the Golden Deer route.)
In it, Mercedes is shown weeping over Emile, her brother who is also the masked warrior Jeritze and the Death Knight. She begs forgiveness for killing him, before running off with Annette.
It's all but confirmed in the story that Emile / Jeritze is the Death Knight. But not only is this solid proof, it's also the only portrayal of the Death Knight unmasked—besides just seeing Jeritze out and about—as far as we can tell. For a character that plays such a long-running thorn in your Byleth's side, it's interesting to see this side of the character, as well as having one of your students have such a link. It makes you wonder if there are other small scenes like this hidden around that only a fraction of players are stumbling upon.
Of course, to find it, you'll have to have Mercedes and Caspar in your party. This means one recruitment for the Blue Lions, or two for the Golden Deer. To be sure you're up to snuff on their recruitment requirements, check out our Fire Emblem: Three Houses recruitment guide.