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Ultimately, they had a hard time reaching any conclusion, with the only evidence of what had happened being everyone's memories, and with nothing left behind from their fight against Koga Saburo, as everything faded away, there was little they could do to find him.
Frank tried offering the items "dropped" by him after his defeat, but they were generated by his powers and weren't exactly pieces that belonged to him, so they couldn't be used to track the origin of this Mythological Spirit, the mysterious master that summoned him.
The only thing they could do right now is send several people to scout the entire city looking for strange signals of corrupted energy or spiritual power they could track and find what was happening.
Meanwhile, the Great Ancestor said she would attempt to do some clairvoyance to find out if there was something she could find through this method.
