The elf-like War Mage aboard the Dismemberment Limited, hunting Levi's bones each run to grow a Flesher army — beheaded by Carl's Hole trick.
Dismember is the War-Mage who rides the sealed rear cars of the Dismemberment-Limited, commanding a horde of Flesher skin-minions. Each run he tries to breach the passenger car, re-sleeve Levi-the-Seventh, and flay any crawlers aboard — boasting he's done it six times before, once to a larger group, and needs 'eight more iterations' to become whatever he's building toward. Silver-haired and elf-like (though he snarls that he is not an elf), he taunts Carl through the metal barrier with promises of a slow flaying kept alive by his magic.
Carl stalls him with a mock 'secret,' has Princess-Donut open a Hole in the barrier, reaches through to seize Dismember by the hair, and snaps the hole shut — cleanly decapitating him ('What was that, bitch?'). His severed head goes into Carl's inventory; the recap footage of the kill makes Carl look unhinged.
A tall, elf-like War Mage with long silver hair (insists he is not an elf); seen mostly as a menacing silhouette and a pair of grasping hands through the barrier.
A named-train War Mage boss farming crawlers' skin and bones to build an army — Carl's grisly kill.