Rhiv and Therrien, as you express belief in the fact that there is, indeed, a door, the stone wall takes on the same translucent property. You no longer believe it to be solid stone, but a highly effective illusion. In point of fact, it was such a powerful illusion spell, that your brains reacted to it to create the effects that your bodies felt, including the resistance against your weapons.
The weather has calmed slightly, though it seems the Cold Woman did not create the snow storm, only exacerbated it. The wind still whips through the pass, with slightly less ferocity than moments before. It's still snowing. The baby seems cold, but not in danger of harm. The horses are doing okay, but I wouldn't recommend leaving them up here in the open.
Fortunately, as the illusion passes, the area that the stone wall was occupying is revealed to be a sort of cave entrance area, about 10 feet square, with a roof. It would be a safe place to leave the horses, provided no one else comes along and bypasses the illusion spell.
To'ot, you still see the door. The rocks between you and the door have taken on a permanent translucence. You can all see the door, and can pass through the illusion. You can throw your flame at the door without any difficulty.
To'ot, roll your cure wounds spell. 1d8 + 2 + your Wisdom modifier.