The Dana Hotel’s sea monster-inspired bar brings the ocean to downtown Chicago. Cthulhu is a fictional creature described by H.P. Lovecraft in the short story “The Call of Cthulhu” as a terrible monster that simultaneously resembles an octopus, a dragon, and a human caricature, with “a pulpy, tentacle head” atop “a grotesque and scaly body with rudimentary wings.” It’s also one of the drinks on the menu at Leviathan, the new bar from the Fifty/50 Group on the mezzanine level of the Dana Hotel adjacent to sister restaurant Portsmith.…