A better option would be to look at Van Richten's Guide to Ravenloft, a sourcebook that includes several new options for character creation, villains, and a new setting that aligns perfectly with ...

Van Richten's Guide to Ravenloft Another foe from Van Richten's Guide to Ravenloft, a Brain in a Jar is a CR three monster that, while lacking in mobility, can serve as a difficult magical threat ...