This was based on the novel where Konrad made a meat statue of the Emperor, she proceeded to talk with it and it replying back.
Big E regretted not having one last long talk with Konrad, while Konrad was asking if he designed Curze to be the Terror in the Dark with a twisted mind, and if he too saw the deaths of her sisters, Ferrus being decapitated, Rogal being torn apart etc.
It wasn't clear if it was a hallucination with Curze' mind being extremely unstable, or if Emperor actually projected himself before Curze.