"We followed the map as best we could, periodically checking our bearings using the chronograph and the sextants that the seer had given us. Eventually we found the deserted location that corresponded to the coordinates on the rapidly disintegrating map. And we began digging...
"We started a trench that went down about fifteen feet into the baking sand and headed due South. After a few hours our spades rang with the sound of steel on stone and as it did so the group gathered round to see what we had hit. Some hand digging revealed a dark black stone that had been carved with a strange texture on it's surface like a series of overlapping layers of petrified tendrils frozen for perhaps a thousand years. It looked and felt utterly alien, and yet our goal lay in the centre of this forbidding artefact.
The lengthy process to do something necessary or a magical scroll needed is inscribed on the other side of a great tapestry and can't be removed. For more fun it could be in the kings throne room. Try to hide in shadows with a 20*5 (yards/meters) monstrosity!