Multiple questions here for the last episode: First, How did Kirinmaru, Towa and Moroha end up in the Meido? Secondly, do you think that Inuyasha, between Final Act and Yashahime, has mastered his own demon blood to access to the crazy Susanno-esque forms that his daughter and niece used? Finally, what do you suppose Towa's new sword is all about? Do you think that Totosai forged it?
First, we have to ask ourselves. “Is it a Meidou?”
Because the Meidou usually didn’t have big planets like that.
We also see Byakuya do something similar with his magic gourd, In the manga, the scene just shifts to the dimension after Byakuya uses the Gourd. But in the anime he could summon a moon and send them to another realm.
I mean, it could also have something to do with Taishou's gravesite.
InuYasha The Final Act Episode 15, Dragon Scaled Tessaiga was used to cut into demonic vortex. Towa has a similar ability. When Tessaiga and Tenseiga were trying to merge to become one that was said to be the only way to get out of a Meidou before InuYasha got Black Tessaiga, was to cut into his own Demonic Vortex which could lead to death.
Meidou Zangetsuha opens a pathway into hell, not outer space. It does look like space, but it isn’t.
The space-like battle may have been more of a realm or area that was created by the convergence of their demonic energy. Evidence of this, is when Moroha leaves her Beniyasha form the area disappears as well.
It’s like a demonic vortex colliding. It’s so much energy it displaces the air and becomes it’s own realm.
- In the Final Act, Inu-Yasha begins to figure out how to control the Great Dog Demon blood. As of right now I don't know if his would appear as a spirit form behind him. Unless they were to implement that idea for future episodes. Because he has been able to control it later on in the series.
- As of Yashahime the Second Act this never happened.
- Towa's new sword in the promo picture is a Chinese Style sword much like Kirinmaru's. It might be the Yukari no Tachikiri which means to "cut ties with" or "severe the tie". Which might be used to seperate Rin from Zero, or Setsuna from the Dream Butterfly. That's just speculation at the moment from what we are given.
- Towa's Sword is the Zanseiken was one of the two swords that came from the God of Stars, Amatsumikaboshi.