Okay, you know what? I'm not giving any of you the chance to overthink this, You're all on the damn elevator.
The platform accelerates as it rises up through the stone veins of the mountain, through widening caverns and secret hollows where phosphorescent lights pass by in the blink of an eye. You all wrap your cloaks tightly against yourselves as the ascent grows chillier.
The platform begins to slow, and soon comes to a stop at the bottom of some deep cleft high up on the mountain. A jagged opening exposes the sky high above you, and about forty feet ahead there are thick iron-bound doors set into a wall of dark stone blocks. Although you can't see the rest of the fortress, you surmise that you have arrived at an entrance to one of its lowest levels.
Two long-fingered, outstretched iron hands serve as door handles. The doors do not appear to be locked.