Rita's best known as the sole survivor of the Nebelville massacre, though "survivor" gets complicated pretty quickly. She spent two centuries living among the town's reanimated dead—her own neighbors, friends, and eventually her parents—all while somehow retaining her humanity and sanity, which honestly seems impossible but here we are.
Things went dark when her own parents bit her. She turned, obviously, and Kaisar (the former knight she'd been traveling with) had to put her down. Except she didn't stay down. She came back as an undead, but different—actually conscious and in control of herself, which shouldn't be possible. Fans often note that her sentience after reanimation is never fully explained, and it's one of the stranger mysteries about her.
These days she's a necromancer who follows Kaisar around on his travels, which makes sense given their history. She's young-looking, probably because she stopped aging at some point, though the exact mechanics of her existence remain vague.
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