Transcription factor; part of the gene cluster responsible for the typical purple-black color of the ergot sclerotia (PubMed:28955461). The ergochrome gene cluster produces several ergot pigments including the yellow ergochrome secalonic acid and its derivatives, as well as the red anthraquinones endocrocin and clavorubin (PubMed:28955461). Expression correlates with the formation of the sclerotia and thus the pigment production (PubMed:28955461).