Trying not to throw the Noah goal out there as that would ruin a lot of CR, as it always does, but if you want a good one I could let him find out something on a major killing. There was this time he hunted down a group of exorcists because they were on his 'delete' list and one of them really didn't want to die and begged for mercy.

Instead of killing him, he implanted a Tease inside of his chest. He then told him he wouldn't kill him if he gave him the location of everyone on his 'delete' list. The frightened Exorcist named Suman Dark did so and on that day 105 Finders and Exorcists died as a result by his hand or the information he received that led to it. Sure, it's a war and that was his enemy but it's still 105 deaths in one day.