Disintegrate v. Iron Door

[Caliban]

1) unattended object that fails its save: disintegrated
2) unattended object that makes its save: 5d6 damage
3) attended object that fails its save: disintegrated
4) attended object that makes its save: 5d6 damage

There is no difference between an unattended and an attended object in terms of the effects of the spell. The only difference is in when/if the object actually gets a save to mitigate the effect.

Unattended objects automatically fail all saves, unless they are magic items. (PHB, page 166, Saving Throws)

 

[hong]

Has everyone in this thread been affected by the stupid gas, or something? Yes, I include myself in that.

 

[Gizzard]

Has everyone in this thread been affected by the stupid gas, or something? Yes, I include myself in that.

It seems so. ;-)

But it looks like its sorted out now:

1) unattended item: disintegrated
2) attended item that fails save: disintegrated
3) attended item that makes its save but has less than 5d6 HPs: disintigrated
4) attended item that makes its save and has more than 5d6 HPs: survives! (but damaged)

(Personally, I'd like to see:

1) unattended item: takes 24d6
2) attended item that makes save: 5d6
3) attended item that fails save: 24d6

but I guess thats some strange 1E holdover.)