Scarlet couldn't get any rest that night. She hand explained everything to Agatha as it was, she talked about the battle in the astral realm, the death of another Argus, and her ending up in another world two years later and not finding a way back because of her supposedly depleted chaos magic.
Agatha explained to her about the endless and why her chaos magic depleted. First Agatha said that the endless were beings that could travel between universes with ease, destined to protect the world from the gods and that they were protected and guided by the new god of destiny. She had no explanation of who created the endless in the first place but she knew that the goddess of destiny had a clue about it. That explains her devotion to protecting the endless.
