The concept of the Castlevania series can easily be repurposed for a Dungeons & Dragons campaign, especially as both franchises take a lot of inspiration from the same sources. The Castlevania series already has an unofficial link to D&D, as the box art for Castlevania 2: Simon's Quest is heavily inspired by the original Strahd adventure for D&D, as was the case with many NES games of the era outright copying movie posters and book covers.
The Castlevania series consists of horror action games. The story takes place in the same world as Bram Stoker's Dracula, except that Dracula keeps coming back from the dead. Dracula's Castle keeps appearing in the world and it's up to the Belmont family (or one of their allies, like Alucard) to brave its halls and defeat Dracula. This involves fighting through waves of bad guys and surviving numerous environmental hazards. The Castlevania series also provided one half of the Metroidvania name, thanks to the design of the incredible Castlevania: Symphony of the Night.
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There is already a gothic-horror D&D 5ecampaign, Curse of Strahd. The problem with Curse of Strahd is that it's designed in a nonlinear way, with elements that are meant to be decided randomly. This means that inexperienced DMs might have trouble running it. A Castlevania-themed campaign can be a lot more straightforward while maintaining a lot of the same iconic elements that new players will instantly be familiar with.
Curse of Strahd takes place in the fantasy realm of Barovia, which is one of the Domains of Dread from the Ravenloft campaign setting. The Domains of Dread can be entered at various points in the D&D multiverse, which means that it's easy to
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