Lots of info behind the workings of tao and tan that tbh, I don't quite understand, but how cool was it to have Gabimaru nonchalantly challenge all the others in a fight
Let's just say that this chapter's lore exposition will resonate a lot more with Chinese, Japanese and Korean readers. I plan to write a detailed Reddit post on this later, but I'll give a simple explanation for now.
Long ago in the Qin Dynasty (221 BC–206 BC) of China, Emperor Qin Shi Huang sought immortality and consulted all manners of professions for such a means. Among them was Xu Fu, ordered to sail to the eastern seas where the mythical Xian supposedly dwell and return with him an Elixir of Life. Folklore tell that Xu Fu sailed to a faraway land but found no such Elixir, and fearing execution upon his failure, he decided to settle on this new land instead. Thus was Japan founded, and Xu Fu (known as Jofuku in Japan) is still a subject of research by historians and scholars today.
What I didn't know was that historically he's also a Taoist and a Fangshi (Houshi in Japan), and for the purpose of this series, he went on to create this island and continue his research into the Elixir of Life.
In his attempts, he created perfect beings in the Tensen, nigh-immortal beings comprising of animal and plant Tao with a perfect balance of Yin and Yang. In essence, they're Homunculi, still assisting him with his millennium-long research of granting immortality to ordinary humans.
By the way, I realised that I never posted Part 3 of my Chinese Myth series on this thread:
As a Chinese native, I was surprised that Kaku-sensei was this daring with his lore. He evidently did his research into Xian mythology and Taoism beliefs, but treading onto well-known legends that span across East Asia? Yikes