What if... Henry Bart spreads his bloodline as far as possible?

Nathan Garrett and his nephew, Dane Whitman, are the most well-known among the Black Knights. However, their origins started during the sub-Roman Britain period, starting with Sir Percy of Scandia who came to King Arthur's court in Camelot from somewhere in Scandinavia.

However, there are many more Black Knights than just the three of then. For example, there is Sir Eobar Garrington, who was the Black Knight that went on the Third Crusade with King Richard I of England. And there is Henry Bart, the Black Knight who was active during the Elizabethan Era as a privateer.

Throughout histories of multiple worlds, they participated in the events that sometimes changed the histories of their worlds.

And this is the story of one of those worlds. The world where Henry Bart the Black Knight altered the course of the world's history by using his "other sword" along with the Ebony Blade.