Thread:ThunderStar321/@comment-30903398-20180416214448/@comment-30903398-20180419003643

I said too much spoiler. Also, it states in game that there are 2 theories concerning that. First is that they may have come to Earth around that time, other theory being that the concept is universal. The sword makes it explicit that they did come to Earth around that time period. Also, how can it be a "theory" of them coming to Earth if the blade is clearly from Earth? If anything, the game implies that the yin-yang is universal.