The death of Kronya is far more horrific than in canon, as a vengeful Byleth stabs her repeatedly with her own Obsidian Blade, a dagger that essentially makes the victim rot while still alive, causing Kronya to die in terrible pain while calling out for her mother. To make matters worse, Kronya is revealed to have been made a child super soldier when she was twelve.
Later on, during the Siege of Enbarr, an Agarthan child assassin kills Hubert with an Obsidian Blade to the throat before driving it into his own body to escape Dimitri, and the author doesn’t skimp on describing the Body Horror that ensues.
The Javelins of Light completely destroy Fort Merceus- and the Empire soldiers stationed there had no idea that anything of the sort was going to happen. They were nearly bombed into oblivion by their own leader, and would have been had they not surrendered.
To make matters worse, Atra reveals that Thales lied to the citizens of Agartha, claiming they had all been destroyed fighting Sothis, meaning he has quite a few left at his disposal.
Edelgard's Hegemon Husk form makes its appearance in chapter 93—but unlike the canon game, where she takes the form on willingly, here she's stripped of her free will and forcibly transformed into a nightmarish abomination that horrifies everyone who sees it:
"At least...the spiderlike abomination had Edelgard's head, surrounded by claws and scales, her eyes gaping black pits of glowing red. Her body is elongated, truly making her as tall as Maurice; its covered in black scales, thick red magic coursing across her entire frame in several thick layers. Her arms drape down her sides, spindly claws extending from each joint – even more twisted and wrong-looking than Marianne's half-beast form. There are...there's no better description than glowing orbs in the giant protrusions of her shoulders. She doesn't have a waist! It looked like a doll made by a particularly disturbed child; all spikes and wrong proportions and inhuman features all over. Her expression was empty, placid; there might be rings around her eyes but Claude can't get close enough to say for certain."
