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What to do with Sunface Fragments
After you've collected all 6 Sunface Fragments from each of the Biomes, go back to Echoing Ruins (Biome 4). Find and enter Selene's home and complete the sequence of events. Afterwards, you'll receive Car Keys. Make your way to Abyssal Scar (Biome 6). Defeat the final boss. When you descend, enter the car with headlights on to see the secret ending.