ooc: Just to be sure I was clear enough, Orerreth's investigation had nothing to do with the day of mourning: he assumed other centre's research brought it; it's a common theory, but not canon (and the Day of Mourning's origin deserve a lot more than a minor role as a McGuffin). He's saying that the things they discovered had the potential to change the world, but it's still unfinished, so it's value is still very high, but not astronomic.
Raven decides that he's telling the truth, except the natural reluctancy to provide details as what they were doing exactly at that hidden Cannith centre.
IC: "Wait a minute." says Orerreth smiling. "I'm moved, but I really didn't expect you to help me, at least beyond what happened at that chapel. It'll really be better for you to return to that tavern: there are powerful people involved in this, and I can't pay you enough."