It’s survival of the fittest witch on Wednesday night’s American Horror Story: Coven. With Fiona (Jessica Lange) killing anyone in her path, Cordelia (Sarah Paulson) and the rest of the coven — Zoe (Taissa Farmiga), Madison (Emma Roberts), Nan (Jamie Brewer) — plot to take her down. Miss Robichaux’s also gets a visit from a surprise guest. Watch this exclusive clip from tomorrow’s “The Sacred Taking” below…