I watched Orsted's fight against Rudeus in Season 1 again and I noticed one interesting detail in addition to what I said earlier about Hitogami being able to snatch soul-related divine jewels. When Rudeus gets to Hitogami, he says that it looks like the soul is being transferred
"However, I'm standing at the center of it. How does that happen? Considering the changes in my appearance... could it be a type of summoning that only affects the mind or the soul?".
And we can further confirm this by the fact that Hitogami can see people's souls
"- Yes. After all, my eyes only see the soul. Of course, I knew that your body and soul are different, but this is the first time I've seen what you really look like."
When Rudeus got to the Hollow World, he saw his old body without any changes (even though he was missing an arm). at the same time after Orsted pierced Rudeus' chest he saw a hole in his chest
"However, this time it was different. The usual feeling of self-loathing did not rise. Instead, I felt a sense of loss, as if there was a gaping hole in my chest. I looked down and found that there really was a large hole. Ah, I knew it. I really died..." .
We also additionally know that Orsted's curse works on the principle of releasing a special mana that should affect specifically the souls of people (Rudeus' body is from this world, but his soul is from ours, which is why the curse does not work). considering this can we say that Orsted and most likely Hitogami (Hitogami's power works on a similar principle) should have passive soul manipulation + when Orsted healed Rudeus he saw the hole in his chest disappear
"Before I realized what was happening, the hole in my chest disappeared."
accordingly this would also mean that Orsted has healing magic that can restore souls. if this is enough for soul manipulation, then this would also mean that soul damage cannot kill Orsted since we know that he already lost to Hitogami once