Shadows are not a thing, but an absence of light. Anywhere the light can not reach will have a shadow. For instance his clothes are casting a shadow on his body. Theoretically, he should really never not be able to use this shadow hiding ability.
It's been made very clear from basically chapter 1 that the demon lord CANNOT move the crystal whence it has been placed down
better than the novel. In it we didn't get the part following black as he fled. So we just got the out of nowhere notice he had died, so we didn't know about his plan to possess despair or that it failed. And we knew less about his possession in general, leaving us very uncertain if he was really dead or not.
As a novel reader, the manga actually gave more information than the novel. The while black fleeing and telling about the plan to posses despair, that wasn't in the novel, we just got sudden he is dead notice, with less understanding of his possession ability. Many of us assumed he would show up again, but it was just left a loose end hanging there all the way to the end.
The details of shadow walk are more fleshed out in the novel. But there are a few restrictions. Size/surface area of the shadow. As well as are the shadows connected. He isn't entering the alt world like most of the other dive into (water, air, fire, or any other spatial walk ability) So he needs the shadow to be connected, he can jump from one to another that arn't connected, but there is a range limit on that.
Probably committed suicide, the way I see it.
So as I have said, this gave more to his death than the novel, in it he declares war, gets away, and then we just get the notice he is dead. We never heard of his plan to posses someone, or that it failed. The readers all thought that he must have possess another to get out of the fight, but the story moved on and there was never another sign of him. This new addition seems to be to put the novel readers theory to rest. The other theory is that he committed suicide as a petty last revenge, as he knew he was doomed anyway, this way he could forever be a boogeyman the MC would have to be wary of, as the MC knows about the possession ability.
That is the theory the novel readers settled on, this way know one knows how he died, so the MC who know about the possession agility has to worry is he really gone. And he was doomed to die already anyways. So it was a last petty, underhanded and spiteful way of attacking so very much his style.
Could still work if the one that got destroyed was a fake and the real one wasn't there in the first place.
well it allows mc to save his dungeon points for something more important
