"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.
Magic should have side effects, both expected and unexpected - fortuitous and deplorable. Expected side effects add anticipation, while unexpected ones increase the drama of the scene. The result can be comedic or dire, it dpends on which circumstances work best for your game.