Prompt: A menacing portrait of the demonic guitarist Shagrath of the legendary Norwegian black metal band Dimmu Borgir, wearing gruesome battle armor decorated with skulls and spikes, wicked guitar raised, face obscured behind a bloodied tribal mask concealing only cold blue eyes shining with malice, amidst a hellish fiery landscape of volcanic ash under a burning red sky, rendered in the darkly hyperrealistic style of Zdzisław Beksiński with crisp gothic details