Make a 3D third-person boss fight game in one web page: a lone knight faces a giant fire dragon in a ruined cathedral at night, with broken pillars, stained glass and embers in the air. WASD to move, mouse to turn the camera, click to swing the sword, Shift to dodge roll, keys 1, 2 and 3 for three special skills, Q to heal. The dragon has three phases with different attacks: fire breath, tail sweeps, flying dives and falling meteors, with telegraphed warnings. Add hit stop, screen shake and damage numbers, health and stamina bars, the boss health bar with its name, plus victory and death screens. Make it look as cinematic as you can. It should feel epic the moment it loads.