non fiction book cover art, factual, informative, clean, subtle colors in the heart of the town's oldest quarter, where cobblestone streets meet crumbling facades, a 35 year old man stands frozen in terror before a glowing portal. his eyes are sunken, his skin pale and clammy, as if drained of life force by some unseen presence. from his chest protrudes a twisted, pulsing mass of writhing tendrils, each tipped with razor sharp claws that seem to be pulling him slowly apart from the inside out. the air around him is heavy with an otherworldly stench, like decay and corruption given form. above, the sky seems to writhe in agony, as if reality itself is being warped by some terrible force emanating from the portal. the entity at its center appears as a glowing, crystalline core surrounded by swirling vortex of darkness, pulsing with an eldritch power that makes the very air seem to tremble with fear.