Tom Harrow

Tom Harrow is a DC comics super-villain and a malignant warlock from Fables who had power over plague and disease, traits valued by the evil-minded Snow Queen when she chose him to be one of her warlocks destined to go forth and massacre the human world (much like the Horsemen society that serve Apocalypse in Marvel) : obviously Tom Harrow served as the horseman of pestilence and massacred entire towns, his ultimate goal being to kill as many humans as possible to pave the way for the Snow Queen's next stage of invasion.