An intricately detailed illustration featuring a mystical kitsuné with shimmering fur, an imposing Oni with a fierce expression and traditional armor, a mysterious Nué with swirling clouds around its serpentine body, and a majestic Tengu with powerful wings and a fox-like mask, all set amidst a vibrant and whimsical backdrop of colorful fungi decor. The scene is captured in a vivid anime style, with high-definition clarity and 2K resolution, showcasing each character's unique design with creative embellishments such as glowing eyes for the kitsuné and intricate tattoos on the Oni, maintaining the core concept while adding small imaginative touches.