The moral ambiguity was the best part! Put the party into a situation where they could ally with a profoundly evil power to achieve a great good. Or maybe give

The moral ambiguity was the best part! Put the party into a situation where they could ally with a profoundly evil power to achieve a great good. Or maybe give them a powerful magical item that they discover is slowly corrupting them as they start wielding it for the right reasons... I wish more of our current crop of politicians had played RPGs that way...