Do you own a freezer? Does it contain meat? Does that meat bend much, or at all? Have you ever tried to flex a joint on a frozen chicken leg? That's what happens when a critter that isn't warm blooded spends significant time in conditions below freezing. It is an ugly bag of mostly water, and will freeze hard as a rock.
My freezer is meat-free, but I'm familiar with the phenomenon.
But frost giants are immune to cold. Is this because their blood is warm, or is it independent of their bloodedness. At least some depictions of frost giants (and even moreso the 4e frost titans) give the impression that they are somewhat ice-tacular all the way down.
unless we move over into magical or otherwise quite alien biology - but then once again we are admitting things don't work the way they do in our world, and that opens the door to other non-intuitive behavior.
Sure, but frost giants aren't canonically described as being fleshy mammals, are they?
Whereas the product of a fireball is canonically described as
flame, of the same sort as a dragon's breath, which canonically
is fire all the way down.
in the 5e fireball case, the saving throw is irrelevant. If you are wearing it or using it, the fireball won't ignite it whether you make the save or not.
Well, that is being discussed in another thread!
If you move this to the in-fiction meaning of saving throws and hit point loss, you can also still eave yourself in the space of not being able to come up with a narration that fits the observed results and intuition all the time. Saving throws and hit points are *abstract* and thus don't always lead comfortably to concrete narrations.
This is why some folks go instead to having it covered by the world metaphysic - rather than try to find a narration of the savign throw and hit point loss that fits *real world* physics, we note that magic is a little wonky, and sometimes doesn't follow the real world version of things. You lose some hit points, without subsidiary effects and move on.
Which is to say, "PAY NO ATTENTION TO THE MAN BEHIND THE CURTAIN!" If you think too hard about it, you *will* find holes, whatever your take on HP and saving throws.
For me, this is the crux. (That's not to say it is, or should be, the crux for everyone.) I think that avoiding wonky narration is a pretty high priority.
There are corner cases - for instance, someone chained to immovable rods "floating" in the plane of vacuum (no crevices to duck into, no possibility of dodging, etc) - but I have tended to find that they are few and far between.
And that really is the question the OP is asking in this thread - and seemingly a dozen others
This is not correct. I'm not that interested in whether or not fireball can be used to destroy an enemy's gear or equipment - that's more of a side-issue that is brought into play by what I
am interested in. And that is the relationship between the mechanics and the fiction, which I think (again, others may not) is fundamental to the difference between a RPG and a boardgame (or CCG, videogame, etc).
This is something that I've been interested in, and posting about, for some time. (For instance, in
this post from mid-2011 I observed that "a power with the fire keyword, that deals fire damage, can set fire to a tree. A power with the weapon keyword, that deals only untyped damage, cannot set fire to a tree. I think this is fairly obvious".)
I was surprised to see the contrary view being very strongly supported by some posters in recent threads, and hence am curious to see how far it extends. Although I was talking about 4e and those posters are talking about 5e, I don't see that the two games are noticeably different in this particular respect.
As far as the damaging of equipment is concerned, as I've already posted I favour Gygaxian hit points: as long as the character still has hit points left then s/he took only a nick or a scratch at worst, and hence whatever objects s/he is carrying or wearing will be no worse than lightly singed. But if someone has been burned to death by a fireball, then I think narrating that their clothes, or scrolls, or whatever are charred - and their ice pendants melted - is fair game.