Concept: Capture the fierce determination and legendary prowess of Cu Chulainn, the legendary Irish warrior, in a moment of his most iconic transformation. Central Figure: Depict Cu Chulainn mid-transformation into his monstrous war form, known as the Rastrad. His body should be contorting and glowing with otherworldly energy, his muscles bulging, and his eyes blazing with fierce determination. He should be clad in minimal armor, with a spear or his signature weapon, the Gae Bolga, held high. Background: Showcase a chaotic battlefield as the backdrop, filled with fallen warriors and the faint silhouettes of his enemies. However, the focus should remain on Cu Chulainn and the transformation taking place. Foreground: Include subtle elements that hint at his humanity and heritage. This could be a faint image of a young Cu Chulainn in the corner, or a single dog paw print glowing amongst the chaos, symbolizing his connection to his hound. Mood: The image should evoke a sense of awe, power, and controlled rage. It should capture the intensity of battle while highlighting Cu Chulainn's unyielding determination and legendary strength. Use a dynamic composition with a focus on movement and energy. Employ a dark and dramatic color palette with contrasting highlights to emphasize the chaos of the battlefield and the otherworldly nature of Cu Chulainn's transformation. Consider incorporating Celtic symbols like the triquetra or spirals into the background or his weapon to add depth and cultural significance.