As for what would happen to Asgard after Odin Vault was destroyed and the undead army was released, that was not something Hela was thinking about right now. In fact, if Hela had been strong enough, she would not have minded destroying Asgard with her own hands.
Naturally, Asgard had no way of knowing that Hela was plotting against it. After Thor returned to Asgard, he went straight into seclusion.
There was nothing else he could do. On this trip out, Thor had truly seen far too much, and he had witnessed all kinds of powerful beings—especially All-Black the Necrosword and Knull, the God of Symbiotes.
Before this, Thor had never imagined that so-called Gods could also be restrained. Gorr clearly had not been stronger than him when he possessed All-Black the Necrosword, but after seeing the sword's power, Thor had not had the slightest intention of fighting Gorr.
After all, the former Thor had dared to draw his blade against anyone at the same level. Before he met Robet, even when facing enemies stronger than himself, he had never been afraid. He would have simply charged straight in!
But this time, on Indigell, after Gorr and All-Black the Necrosword appeared, Thor, who had sensed the danger, had acted as if he had turned invisible. He had no presence throughout the entire affair, until everything was finally resolved. Only then did Thor gain a little presence, eventually stepping forward to open the Bifrost with Gungnir and bring everyone back to Earth.
Thor did not feel particularly ashamed about any of this, but he could still feel an immense pressure, one that made him crave strength even more. That was why, after returning to Asgard, he had immediately chosen to enter seclusion.
The problem was that Thor's strength had only just