In a fiery, nightmarish landscape, a hellish legion of misshapen and horrific demonic creatures surges forward, captured in vivid photorealistic detail. The scene is a chaotic inferno, with the ground cracked and glowing with molten lava, and the sky a swirling vortex of red and black, filled with ash and fire. The demons are a grotesque assortment of twisted forms—some with multiple limbs, others with gaping maws filled with razor-sharp teeth, and many covered in jagged, bone-like armor. Their eyes glow with malevolent intensity, and their bodies pulse with dark, unholy energy. Amidst the chaos, towering, monstrous figures lead the charge, their roar shaking the very ground. Above the horde, a burning banner of text, glowing with an ominous red light, reads: 'THE ONLY THING THEY FEAR IS FLUX.' The photorealistic rendering captures every horrific detail—the textures of the demons' flesh, the embers drifting through the air, and the sheer overwhelming force of the demonic onslaught, contrasted by the stark, bold text that stands as a grim reminder of the Doom Slayer's relentless power.