The forces of good were in dire times.
TIamat and Paladine had taken larger reins in the mortal worlds.
Worse for the good dragons, is that Tiamat proved far more effective at tricking the good dragons. A race race of dragon monstrosities born from several sources giving rise to dragon spawn and draconians in some circles.
Only the dung of Bahamut could put things right. After assuring several paladins that it was indeed most holy, those wise men were shocked to discover that they had undergone changes! The dung of Bahamut was indeed capable of the greatest of transformations. It's divine essence burning through ever last remanent that was not of dragon blood. After all, only a dragon could survive the dunking of the dung.
Now the droppins of Bahamut are sought out and cared for like the holy relics they are. Woe be to the draognspawn or draconian that would attempt to steal such sacred artifacts as it's power would consume those whose hearts are not of the light.