The Idunn Apple is a mystical fruit with a semi-realistic, cinematic appearance, glowing with a soft golden hue that signifies its divine origin. Its shape is perfectly round with a slight organic irregularity, featuring a smooth, polished surface that reflects light subtly. The stem is short and twisted, appearing as if naturally grown from the branches of Yggdrasil, with leaves that are slightly wilted yet vibrant, indicating the apple's eternal vitality. The skin has a faint, intricate pattern resembling Norse runes that glow faintly when the apple is held, adding to its magical allure.