That’s um…not even close
The high fantasy is in check, but it is also epic and dark fantasy.
Warrior, I suppose you can say so.
But in the least someone would guess ‘Valkyrie’ which is even closer to a specific.
Restore a fallen kingdom: Well, that is part of it. Though given from the context of Valkyrie, you can guess that it is not their kingdom. Also guess that it is also based on norse mythology.
Given from the darker background, one can guess that there will be tragedy.
Given from the text provided, one can guess that it involves morals
As for the name of title itself, I wouldn’t expect anyone to get this right, probably only 1 in every one thousand gets it correct.
Restoration typically means returning something to how it once was.
So this is where Critical Thinking is needed. Using the name title name, the specifics of the cover itself, the dark background, as well as the words provided.
One can roughly conclude that.
Through the endless nightmare, one who wishes to return to a certain time. Emotions clash, morality tested, and even more so than that, a past that eternally haunts.
Now everything else, I wouldn’t expect someone to get it, anything deeper is around one in a thousand, which you’d need to see the other two book covers to identify the story accurately.
This is typically what one can guess accurately without any further information.