Scythe of Innomable Rites
The chains are awkward to navigate, but they're big enough that you can safely cross them without risk of falling. And despite the glowing magma below you, the air is just hot, not scalding. And when you reach the anchoring ring of the fortress, the temperature drops to a comfortable warmth.
But you can tell something is wrong in the fortress itself. The place is clean, but you see a sword on the floor, just out of the nearest entrance to your right. You can't hear anyone or anything, other than the wind and the rumbling of the volcano below. There were people here, but something took them.
To Gorrid's eyes, the fortress is an amazing defensive position... if there's a magical way to bring in food and water. Without magical help, there's no way this place would survive a siege. It's also too out of the way to justify expending serious resources to hold it, as it doesn't control any useful road. So there's no reason the orcs would try to take the place over...
And yet, looking down the slopes of the mountain, you can see raised banners, marked with dragon skulls, making their way up the mountain.