Just wanted to provide context for my opinions, that's all
Destroyed by a Lightner WITHIN the Dark World, and objects picked up WITHIN the Dark World
Yes, Tenna and those items in the Light World are still just regular ass objects, but that doesn't change the fact that events within the Dark World changed them in some way, and that seems to imply that, in some way, shape, or form, what happened within the Dark Worlds ACTUALLY HAPPENED. You may see it differently, and that's fine, but that doesn't flat-out disprove my view either.
We're kinda getting into semantics here, and we don't have all the info necessary to prove one way or the other, so how about we call it a draw, and we move on with our lives? You think Dark Worlds are purely mental, I think they're physical. All we can do is wait for Chapter 5, and maybe then we'll have our answers