Sebastian at Hogwarts, young wizard, Slytherin robes, green and silver, determined expression, casting spells, ancient magic, dark arts, mysterious grimoire, candlelit room, stone walls, Hogwarts castle, magical atmosphere, ambient lighting, dynamic shadows, full-body shot, intricate wand movements, intense gaze, narrative-driven scene, interactive environment, enchanted forest background, moonlit night, 3/4 view, high-resolution textures, detailed character model, action pose, immersive storytelling, interactive spellcasting, velvet cloak, silver trim, magical duel stance, gothic architecture.