An epic historical fantasy scene of a grand, ancient castle with tall towers and fortified walls perched on a rocky mountain peak. A ground of sandy earth forms underneath, surrounded by ancient desert ruins and rolling sand dunes. In the far distance, sharp snow-capped mountains rise under a thick, cloudy sky. The entire image is dominated by an atmospheric color palette of dark neon green and deep, dark crimson red. The sandy dunes and ruins glow with an ominous, dark red hue, while the sky and the dense forest below the monument are cast in a haunting, high-contrast dark neon green light. Rendered in 8K resolution using Unreal Engine 5 technology, this image evokes an intense atmosphere where a forgotten civilization's last monument stands overlooking the neon green forest. FnsyCstl, DsrtRuinsO