A full character turnaround sheet of a plague-eaten cathedral bishop transformed into a walking necromantic abomination, rotted mitre crown sprouting twisted bone spurs and parasitic fly-winged gremlins, corrupted holy vestments fused with pulsing necrotic flesh and writhing shadow tentacles, clutching a shattered golden crozier that drips with infected dark ichor, dozens of cursed soul wisps trapped within rusted iron cages dangling from his belt, dramatic hellfire backlighting with crumbling gothic cathedral pillars and hellish red aurora piercing through broken stained glass, deep infected green necrotic black corrupt gold arterial crimson bone white and ash gray color palette, Painterly digital art style, concept art for video game, front and back view with corrupted clergy lore details