@wanderez: Like MYGOD101 said, the Dragonborn can just BFR Yhwach into another dimension using the Black Books. He can also uses Mehrunes Razor to send Yhwach's soul to Mehrunes Dagon, effectively countering his regeneration. Being intangible won't help Yhwach since magic and Tonal Magic such as the Thu'um can easily hurt ghosts, which are intangible.
For your last question, yes, the Dovahkiin can kill Yhwach. Dragonrend shout is a conceptual shout that can impose the concept of mortality to an immortal being. So Yhwach can get killed if the Dovahkiin uses the Dragonrend shout.
Yhwach has his own dimension and BFR. Conceptual power negation was already used on Yhwach by Ichibei who named/created everything in the afterlife, and controls all the darkness in the universe. Guess what? Almighty negated power negation.
I mean....when you can post a Scan of Yhwach Escaping from a 6-D Separate constructed of existence then we have a debate. Ichibei isn't even close to Dragonborn level of power, even if you say Ichibei is universe level, when he did that.
the Hax Dragonborn has is just far too much for anyone in Bleach, even with the Verse working together.
-Dragonborn is just far too fast for them.
-Dragonborn is far to hax for them.
-Dragonborn is far more durable then them.
Its hard to go against someone who has over 100 ways to win the fight casually just by speaking.
"Escaping from a 6-D Separate constructed of existence " why is this stopping Yhwach from entering his own dimension that he created which can only be accessed by a void creating footholds to not fall eternity? I didn' said Ichibei was universal. The character said he controls all the darkness in the universe, so no matter if you steal his powers as Yhwach did, he can still use the rest of the darkness left in the world.
I'll let Yhwach explain it himself
No....I just going to say he can't. Because once you are sent to the Realm of oblivion you are at the mercy of the Gods who controls said realms you fall into. So...unless you think Yhwach is going to overpower the Gods there who ranges from universal, to Complex Mulitversal, to far beyond that depending on which Realm he goes to...then he isn't coming back.
I would argue that he can indeed.
Light Novel Feats Lore of The Reio/Soul King who Yhwach absorbed and took his power: Source.
"During that age, all of creation was in a state of ambiguity. There was neither life nor death; progression and regression flickered to and fro. Swaying and swaying slowly; this waning and waxing world waited for a hundred million years to cool down. Eventually, Hollows became a part of the circulation of souls." The monk spoke in a matter-of-fact tone; quietly reminiscing about the world that existed before the birth of Hueco Mundo and the World of the Living.
"But before long, Hollows began devouring humans. And so, the circulation ceased. All those souls came together to form a gigantic Hollow, a Menos. The world became completely still. But you know, it's a strange thing. A new life came into being. As if the world itself naturally rejected it, he destroyed it and turned it into sands of reishi; thus, circulation began once again."
"That was the Rei-o of the first era...?"
One of the new recruits involuntarily whispered; but he hurriedly closed his mouth for fear of having said something profane. But the monk nodded and told him not to worry.
"That's right. Others; with special powers, including myself; appeared, but it is fair to say that the Rei-o stood out; his powers very close to omnipotence and omniscience."
The monk paused, recalling the former Rei-o who had already disappeared from this throne.
"As the Rei-o continued to protect the world from the Hollows by annihilating them; to prevent the world from stagnating, the world itself began to slowly sink into chaos."
The monk went on, stroking his beard.
"However, there were those who did not find this state of affairs agreeable. There were five of them. Although not as much as the Rei-o; they were strong. They were the original founders of the Five Great Noble Houses, including the Shiba family."
The monk told them.
Each of them had different motives.
The Tsunayashiro ancestor was afraid that this mighty power would someday be used against them.
The ancestor of the opposing clan said that it was necessary to have a world that would serve as the lid to cover up the 'pit' that would later be known as 'Hell'.
The Kuchiki ancestor believed that a new order was necessary to solidify the world more.
The Shihoin ancestor said that it was necessary to form a larger circulation to advance the stagnant world.
And the Shiba ancestor wanted to explore the path of purification of Hollows rather than destruction; since they too had hearts.
But their widely varying motives strangely led to the same goal in the end; to split the world. A world of order, a world of implementation, also a paradise of sand where Hollows from two sides would end up in.
Perhaps another form of the world would be born, but the essential thing was the clear separation the world of the 'living' from the world of the 'dead'.
In order to turn this division into a reality, what was required was the power of a man who transcended everything.
"Although the Shiba ancestor tried to talk the Tsunayashiro ancestor out of it, it is said that the Rei-o was tied up and sealed within the crystal. The rest of Soul Society's history was witnessed directly by myself."
A man who was later named the Rei-o.
Using his powers of the Almighty as the 'keystone', the five of them created the foundation of a new world. Soul Society, the Material World and Hueco Mundo. Life and death were separated. The Soul Cycle ushered in a new era.
And then, one day, the ones who managed the Soul Society, came to be known as 'Shinigami'.
"Perhaps it was because he could see the far-flung future.... Maybe he could not escape his fear; or maybe he found some hope in the new world.... I don't really understand... But the Rei-o dared not resist it."
Things to know, The World of Souls a.k.a. Soul Society is made completely of Reishi (spiritual matter) which doesn't mix well with Kishi (Matter) by separating a whole existence of spiritual matter, he had to create a world of matter out of nothing since The Real World didn't exist and are made of two different types of matter. Is well known that humans cannot enter the spirit realm without their bodies been turned into spiritual matter or they will die. Muken is another dimension that exists in the afterlife and it's described that stretches for infinity and is a void. Reio's power could destroy said dimension making it again Universal+.