The Ember Overlord looms above Echo and Li Wei, a towering mass of seething flames and swirling embers. Its body is as large as a mountain, with eyes that burn like twin suns and a mouth that emits billowing clouds of superheated steam with every word. "Foolish insects," it booms, its voice echoing through the trembling dimension, "your puny music is no match for the power of the Infernal Sonata."Li Wei's charge sputters weakly after the intense battle with the Flame Maestros, but he raises it defiantly. Echo's fingers are raw from the furious drumming, yet she grips her peace drum tightly, her knuckles turning white. They exchange a quick glance, a silent promise to stand together against this new threat.The Ember Overlord waves a massive hand, and a wall of fire ten times the height of the pair hurtles towards them. Echo strikes her drum, attempting to create a protective rhythm, while Li Wei channels the last of his energy into a shield. The heat is intense, singeing their hair and clothes as the fire crashes against their defenses. Cracks begin to form in Li Wei's energy shield, and Echo's drumbeat stutters under the onslaught.Just when it seems like the fire will consume them, a faint, melodious sound rings out from the sky. Glowing, musical constellations that had appeared after their victory over the Flame Maestros begin to pulse with a new light. A cool, celestial breeze blows through the inferno, weakening the Ember Overlord's attack.The Overlord growls in anger. "You think the stars will save you?" it roars. With a sweep of its arm, it summons a horde of ember - creatures from the ground. These creatures are made of living fire, their forms shifting and changing as they scurry towards Echo and Li Wei, their claws and teeth crackling with heat.Echo starts to play a rhythmic pattern, a beat that seems to resonate with the cooling constellations above. The sound waves push back the advancing ember - creatures, creating a buffer zone. Li Wei follows up, sending out bolts of energy that target the creatures' weak points. But for every one they defeat, two more take its place.As they fight, Echo notices that the Ember Overlord is drawing power from the core of the dimension. A bright, pulsating red light can be seen deep within the volcano the Overlord emerged from. "Li Wei," she shouts over the din of battle, "we need to cut off its power source!"Li Wei nods, but before they can make a move, the Ember Overlord unleashes a deafening roar. The sound is so powerful that it shatters the nearby mountains into pieces and sends Echo and Li Wei flying through the air. They crash to the ground, bruised and battered.But they don't stay down for long. The Cosmic Lyre, which has been silent since their arrival in this dimension, suddenly begins to glow. Its light spreads through Echo and Li Wei, filling them with a newfound strength. They rise to their feet, their instruments now resonating with a celestial energy.With a determined look, they start to play a duet, a harmonious melody that combines the power of the constellations above and the essence of the Cosmic Lyre. The music creates a path through the horde of ember - creatures, leading them straight towards the volcano and the Ember Overlord's power source.