Without giving too much away here, the party will be tasked with recovering an item from a dungeon. An item whose resting place is initially guarded by celestials intent on stopping anyone recovering said item.
So, unless you have a party of evils ot chaotics, players may well rethink recovering it and start wondering why their patron wants it so badly. So what your looking at is needing to prepare eventualities for that occurence if the players rethink fighting their way through to get the item.